Fix table

- @preserves/core@0.995.206
 - @preserves/schema-cli@0.995.206
 - @preserves/schema@0.995.206

NOTICE

@@ -1,2 +1,2 @@
 Preserves: an Expressive Data Language
-Copyright 2018-2022 Tony Garnock-Jones
+Copyright 2018-2024 Tony Garnock-Jones

README.md

@@ -88,6 +88,6 @@ Tony Garnock-Jones <tonyg@leastfixedpoint.com>
 The contents of this repository are made available to you under the
 [Apache License, version 2.0](LICENSE)
 (<http://www.apache.org/licenses/LICENSE-2.0>), and are Copyright
-2018-2022 Tony Garnock-Jones.
+2018-2024 Tony Garnock-Jones.
 
 ## Notes

_config.yml

@@ -13,5 +13,5 @@ defaults:
       layout: page
 
 title: "Preserves"
-version_date: "February 2024"
-version: "0.994.0"
+version_date: "March 2024"
+version: "0.995.0"

_data/python-versions.json

@@ -1,5 +1,8 @@
 [
-  {"version":"0.993.0","title":"0.993.0","aliases":["latest"]},
+  {"version":"0.995.1","title":"0.995.1","aliases":["latest"]},
+  {"version":"0.995.0","title":"0.995.0","aliases":[]},
+  {"version":"0.994.0","title":"0.994.0","aliases":[]},
+  {"version":"0.993.0","title":"0.993.0","aliases":[]},
   {"version":"0.992.2","title":"0.992.2","aliases":[]},
   {"version":"0.992.1","title":"0.992.1","aliases":[]},
   {"version":"0.992.0","title":"0.992.0","aliases":[]},

_includes/cheatsheet-pexprs-plaintext.md

@@ -17,5 +17,5 @@ Trailer       :=  (ws Annotation)*
 
 Embedded      :=  `#:` SimpleExpr
 Annotated     :=  Annotation SimpleExpr
-Annotation    :=  `@` SimpleExpr | `#` ((space | tab) linecomment) (cr | lf)
+Annotation    :=  `@` SimpleExpr | `#` ((space | tab | `!`) linecomment) (cr | lf)
 ```

_includes/cheatsheet-pexprs.md

@@ -20,4 +20,4 @@ The definitions of `Atom`, `ws`, and `linecomment` are as given in the Preserves
 {:.postcard-grammar.textsyntax}
 | *Embedded*      | := |  `#:` *SimpleExpr*
 | *Annotated*     | := |  *Annotation* *SimpleExpr*
-| *Annotation*    | := |  `@` *SimpleExpr* | `#` ((**space** | **tab**) *linecomment*) (**cr** | **lf**)
+| *Annotation*    | := |  `@` *SimpleExpr* | `#` ((**space** | **tab** | `!`) *linecomment*) (**cr** | **lf**)

_includes/cheatsheet-text-plaintext.md

@@ -11,7 +11,7 @@ commas        :=  (ws `,`)* ws
 
 Embedded      :=  `#:` Value
 Annotated     :=  Annotation Value
-Annotation    :=  `@` Value | `#` ((space | tab) linecomment) (cr | lf)
+Annotation    :=  `@` Value | `#` ((space | tab | `!`) linecomment) (cr | lf)
 
 Atom          :=  Boolean | ByteString | String | QuotedSymbol | Symbol | Number
 Boolean       :=  `#t` | `#f`

_includes/cheatsheet-text.md

@@ -13,7 +13,7 @@
 {:.postcard-grammar.textsyntax}
 | *Embedded* | := | `#:`*Value* |
 | *Annotated* | := | *Annotation* *Value* |
-| *Annotation* | := | `@`*Value* |`#` ((**space** | **tab**) *linecomment*) (**cr** | **lf**) |
+| *Annotation* | := | `@`*Value* |`#` ((**space** | **tab** | `!`) *linecomment*) (**cr** | **lf**) |
 
 {:.postcard-grammar.textsyntax}
 | *Atom* | := | *Boolean* | *ByteString* | *String* | *QuotedSymbol* | *Symbol* | *Number* |

conventions.md

@@ -99,6 +99,22 @@ the usual `@`-prefixed annotation notation can also be used.
       #x"0C0D0E0F"
     ]
 
+## Interpreter specification lines ("shebang" lines).
+
+Unix systems interpret `#!` at the beginning of an executable file specially. The text
+following `#!` on the first line is interpreted as a specification for an interpreter for the
+executable file. Preserves offers special support for `#!`, reading it similarly to a comment,
+but producing an `<interpreter ...>` annotation instead of a string.
+
+For example,
+
+    #!/usr/bin/preserves-tool convert
+    [1, 2, 3]
+
+is read as
+
+    @<interpreter "/usr/bin/preserves-tool convert"> [1, 2, 3]
+
 ## MIME-type tagged binary data.
 
 Many internet protocols use

debian-packages/.gitignore

@@ -0,0 +1,2 @@
+/build.python/
+/*.deb

debian-packages/Makefile

@@ -0,0 +1,10 @@
+PYTHON_PACKAGEVERSION := $(shell ../implementations/python/print-package-version)
+
+all: python3-preserves_$(PYTHON_PACKAGEVERSION)_all.deb
+
+python3-preserves_%_all.deb:
+	./build-python-deb
+
+clean:
+	rm -f *.deb
+	rm -rf build.*

debian-packages/build-python-deb

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+set -e
+
+PYTHON_PACKAGEVERSION=$(../implementations/python/print-package-version)
+DIRTY=
+if ! git diff-index --quiet HEAD --
+then
+    DIRTY=+
+fi
+GITSUFFIX=$(git log --date=format:%Y%m%d%H%M%S --pretty=~git%cd.%h -1)
+VERSION=${PYTHON_PACKAGEVERSION}${GITSUFFIX}${DIRTY}
+
+echo "Building deb for ${VERSION}"
+(cd ../implementations/python && . ./.envrc && make build-only)
+
+rm -rf build.python
+mkdir build.python
+
+(
+    cd build.python
+    tar -zxvf ../../implementations/python/dist/preserves-${PYTHON_PACKAGEVERSION}.tar.gz
+    (
+        cd preserves-${PYTHON_PACKAGEVERSION}
+        cp -a ../../python ./debian
+        cat > ./debian/changelog <<EOF
+preserves (${VERSION}) UNRELEASED; urgency=low
+
+  * Unofficial debian packaging of Python Preserves
+
+ -- Tony Garnock-Jones <tonyg@leastfixedpoint.com>  $(date --rfc-email)
+EOF
+
+        dpkg-buildpackage
+    )
+    cp *.deb ..
+)

debian-packages/python/control

@@ -0,0 +1,14 @@
+Source: preserves
+Section: python
+Priority: optional
+Maintainer: Tony Garnock-Jones <tonyg@leastfixedpoint.com>
+Build-Depends: debhelper-compat (= 12), python3, dh-python, pybuild-plugin-pyproject
+Standards-Version: 3.9.3
+Homepage: https://preserves.dev/
+Vcs-Git: https://gitlab.com/preserves/preserves.git
+Vcs-Browser: https://gitlab.com/preserves/preserves
+
+Package: python3-preserves
+Architecture: all
+Depends: ${python3:Depends}
+Description: Python implementation of the Preserves data language

debian-packages/python/rules

@@ -0,0 +1,6 @@
+#!/usr/bin/make -f
+#export DH_VERBOSE=1
+export PYBUILD_NAME=preserves
+
+%:
+	dh $@ --with python3 --buildsystem=pybuild

implementations/javascript/packages/core/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@preserves/core",
-  "version": "0.994.0",
+  "version": "0.995.206",
   "description": "Preserves data serialization format",
   "homepage": "https://gitlab.com/preserves/preserves",
   "license": "Apache-2.0",

implementations/javascript/packages/core/src/annotated.ts

@@ -1,6 +1,6 @@
 import { Tag } from "./constants";
 import { is, isAnnotated, IsPreservesAnnotated } from "./is";
-import type { GenericEmbedded } from "./embedded";
+import type { Embeddable, GenericEmbedded } from "./embedded";
 import type { Value } from "./values";
 import type { Encoder, Preservable } from "./encoder";
 import type { Writer, PreserveWritable } from "./writer";
@@ -52,7 +52,7 @@ export function formatPosition(p: Position | null | string): string {
     }
 }
 
-export class Annotated<T = GenericEmbedded> implements Preservable<T>, PreserveWritable<T> {
+export class Annotated<T extends Embeddable = GenericEmbedded> implements Preservable<T>, PreserveWritable<T> {
     readonly annotations: Array<Value<T>>;
     readonly pos: Position | null;
     readonly item: Value<T>;
@@ -67,7 +67,7 @@ export class Annotated<T = GenericEmbedded> implements Preservable<T>, PreserveW
         return this;
     }
 
-    static __from_preserve__<T>(v: Value<T>): undefined | Annotated<T> {
+    static __from_preserve__<T extends Embeddable>(v: Value<T>): undefined | Annotated<T> {
         return isAnnotated<T>(v) ? v : void 0;
     }
 
@@ -109,21 +109,24 @@ export class Annotated<T = GenericEmbedded> implements Preservable<T>, PreserveW
         return true;
     }
 
-    static isAnnotated<T = GenericEmbedded>(x: any): x is Annotated<T> {
+    static isAnnotated<T extends Embeddable = GenericEmbedded>(x: any): x is Annotated<T> {
         return isAnnotated(x);
     }
 }
 
-export function annotate<T = GenericEmbedded>(v0: Value<T>, ...anns: Value<T>[]): Annotated<T> {
+export function annotate<T extends Embeddable = GenericEmbedded>(
+    v0: Value<T>,
+    ...anns: Value<T>[]
+): Annotated<T> {
     const v = Annotated.isAnnotated<T>(v0) ? v0 : new Annotated(v0);
     anns.forEach((a) => v.annotations.push(a));
     return v;
 }
 
-export function annotations<T = GenericEmbedded>(v: Value<T>): Array<Value<T>> {
+export function annotations<T extends Embeddable = GenericEmbedded>(v: Value<T>): Array<Value<T>> {
     return Annotated.isAnnotated<T>(v) ? v.annotations : [];
 }
 
-export function position<T = GenericEmbedded>(v: Value<T>): Position | null {
+export function position<T extends Embeddable = GenericEmbedded>(v: Value<T>): Position | null {
     return Annotated.isAnnotated<T>(v) ? v.pos : null;
 }

implementations/javascript/packages/core/src/bytes.ts

@@ -1,5 +1,5 @@
 import { Tag } from './constants';
-import { GenericEmbedded } from './embedded';
+import type { Embeddable, GenericEmbedded } from './embedded';
 import { Encoder, Preservable } from './encoder';
 import { Value } from './values';
 import type { Writer, PreserveWritable } from './writer';
@@ -52,6 +52,18 @@ export class Bytes implements Preservable<any>, PreserveWritable<any> {
         return new Bytes(Uint8Array.of(...bytes));
     }
 
+    static fromLatin1(s: string): Bytes {
+        // Takes codepoints in [0..255] from s, treats them as bytes.
+        // Codepoints outside that range trigger an exception.
+        const result = new Bytes(s.length); // assume all the codepoints are OK
+        for (let i = 0; i < s.length; i++) {
+            const n = s.charCodeAt(i);
+            if (n >= 256) throw new Error("Codepoint out of range for 'latin1' byte encoding");
+            result._view[i] = n;
+        }
+        return result;
+    }
+
     static fromBase64(s: string): Bytes {
         return new Bytes(decodeBase64(s));
     }
@@ -136,14 +148,18 @@ export class Bytes implements Preservable<any>, PreserveWritable<any> {
         return textDecoder.decode(this._view);
     }
 
-    __as_preserve__<T = GenericEmbedded>(): Value<T> {
+    __as_preserve__<T extends Embeddable = GenericEmbedded>(): Value<T> {
         return this;
     }
 
-    static __from_preserve__<T>(v: Value<T>): undefined | Bytes {
+    static __from_preserve__<T extends Embeddable>(v: Value<T>): undefined | Bytes {
         return Bytes.isBytes(v) ? v : void 0;
     }
 
+    toLatin1(): string {
+        return String.fromCharCode.apply(null, this._view as any as number[]);
+    }
+
     toBase64(): string {
         return encodeBase64(this._view);
     }

implementations/javascript/packages/core/src/compound.ts

@@ -1,12 +1,12 @@
 import type { Compound, Value } from "./values";
-import type { GenericEmbedded } from "./embedded";
+import type { Embeddable, GenericEmbedded } from "./embedded";
 import { Dictionary, Set } from "./dictionary";
 
-export function isCompound<T = GenericEmbedded>(x: Value<T>): x is Compound<T>
+export function isCompound<T extends Embeddable = GenericEmbedded>(x: Value<T>): x is Compound<T>
 {
     return (Array.isArray(x) || Set.isSet(x) || Dictionary.isDictionary(x));
 }
 
-export function isSequence<T = GenericEmbedded>(x: Value<T>): x is Array<Value<T>> {
+export function isSequence<T extends Embeddable = GenericEmbedded>(x: Value<T>): x is Array<Value<T>> {
     return (Array.isArray(x) && !('label' in x));
 }

implementations/javascript/packages/core/src/decoder.ts

@@ -1,24 +1,25 @@
 import { Annotated } from "./annotated";
 import { DecodeError, ShortPacket } from "./codec";
 import { Tag } from "./constants";
-import { Set, Dictionary } from "./dictionary";
+import { Set, Dictionary, DictionaryMap } from "./dictionary";
 import { DoubleFloat } from "./float";
 import { Record } from "./record";
 import { Bytes, BytesLike, underlying, hexDigit } from "./bytes";
 import { Value } from "./values";
 import { is } from "./is";
-import { embed, GenericEmbedded, Embedded, EmbeddedTypeDecode } from "./embedded";
-import { ReaderStateOptions } from "reader";
+import { GenericEmbedded, Embeddable, EmbeddedTypeDecode } from "./embedded";
+import { ReaderStateOptions } from "./reader";
+import { stringify } from "./text";
 
 export interface DecoderOptions {
     includeAnnotations?: boolean;
 }
 
-export interface DecoderEmbeddedOptions<T> extends DecoderOptions {
+export interface DecoderEmbeddedOptions<T extends Embeddable> extends DecoderOptions {
     embeddedDecode?: EmbeddedTypeDecode<T>;
 }
 
-export interface TypedDecoder<T> {
+export interface TypedDecoder<T extends Embeddable> {
     atEnd(): boolean;
 
     mark(): any;
@@ -26,13 +27,13 @@ export interface TypedDecoder<T> {
 
     skip(): void;
     next(): Value<T>;
-    withEmbeddedDecode<S, R>(
+    withEmbeddedDecode<S extends Embeddable, R>(
         embeddedDecode: EmbeddedTypeDecode<S>,
         body: (d: TypedDecoder<S>) => R): R;
 
     nextBoolean(): boolean | undefined;
     nextDouble(): DoubleFloat | undefined;
-    nextEmbedded(): Embedded<T> | undefined;
+    nextEmbedded(): T | undefined;
     nextSignedInteger(): number | bigint | undefined;
     nextString(): string | undefined;
     nextByteString(): Bytes | undefined;
@@ -46,7 +47,7 @@ export interface TypedDecoder<T> {
     closeCompound(): boolean;
 }
 
-export function asLiteral<T, E extends Exclude<Value<T>, Annotated<T>>>(
+export function asLiteral<T extends Embeddable, E extends Exclude<Value<T>, Annotated<T>>>(
     actual: Value<T>,
     expected: E): E | undefined
 {
@@ -165,11 +166,11 @@ export class DecoderState {
         }
     }
 
-    wrap<T>(v: Value<T>): Value<T> {
+    wrap<T extends Embeddable>(v: Value<T>): Value<T> {
         return this.includeAnnotations ? new Annotated(v) : v;
     }
 
-    unshiftAnnotation<T>(a: Value<T>, v: Annotated<T>): Annotated<T> {
+    unshiftAnnotation<T extends Embeddable>(a: Value<T>, v: Annotated<T>): Annotated<T> {
         if (this.includeAnnotations) {
             v.annotations.unshift(a);
         }
@@ -187,7 +188,7 @@ export const neverEmbeddedTypeDecode: EmbeddedTypeDecode<never> = {
     },
 };
 
-export class Decoder<T = never> implements TypedDecoder<T> {
+export class Decoder<T extends Embeddable = never> implements TypedDecoder<T> {
     state: DecoderState;
     embeddedDecode: EmbeddedTypeDecode<T>;
 
@@ -217,13 +218,14 @@ export class Decoder<T = never> implements TypedDecoder<T> {
         return result;
     }
 
-    static dictionaryFromArray<T>(vs: Value<T>[]): Dictionary<T> {
-        const d = new Dictionary<T>();
+    static dictionaryFromArray<T extends Embeddable>(vs: Value<T>[]): Dictionary<T> {
+        const d = new DictionaryMap<T>();
         if (vs.length % 2) throw new DecodeError("Missing dictionary value");
         for (let i = 0; i < vs.length; i += 2) {
+            if (d.has(vs[i])) throw new DecodeError(`Duplicate key: ${stringify(vs[i])}`);
             d.set(vs[i], vs[i+1]);
         }
-        return d;
+        return d.simplifiedValue();
     }
 
     next(): Value<T> {
@@ -237,7 +239,7 @@ export class Decoder<T = never> implements TypedDecoder<T> {
                 const v = this.next() as Annotated<T>;
                 return this.state.unshiftAnnotation(a, v);
             }
-            case Tag.Embedded: return this.state.wrap<T>(embed(this.embeddedDecode.decode(this.state)));
+            case Tag.Embedded: return this.state.wrap<T>(this.embeddedDecode.decode(this.state));
             case Tag.Ieee754:
                 switch (this.state.varint()) {
                     case 8: return this.state.wrap<T>(DoubleFloat.fromBytes(this.state.nextbytes(8)));
@@ -253,7 +255,14 @@ export class Decoder<T = never> implements TypedDecoder<T> {
                 return this.state.wrap<T>(Record(vs[0], vs.slice(1)));
             }
             case Tag.Sequence: return this.state.wrap<T>(this.nextvalues());
-            case Tag.Set: return this.state.wrap<T>(new Set(this.nextvalues()));
+            case Tag.Set: {
+                const s = new Set<T>();
+                for (const v of this.nextvalues()) {
+                    if (s.has(v)) throw new DecodeError(`Duplicate value: ${stringify(v)}`);
+                    s.add(v);
+                }
+                return this.state.wrap<T>(s);
+            }
             case Tag.Dictionary: return this.state.wrap<T>(Decoder.dictionaryFromArray(this.nextvalues()));
             default: throw new DecodeError("Unsupported Preserves tag: " + tag);
         }
@@ -280,7 +289,7 @@ export class Decoder<T = never> implements TypedDecoder<T> {
         this.next();
     }
 
-    withEmbeddedDecode<S, R>(
+    withEmbeddedDecode<S extends Embeddable, R>(
         embeddedDecode: EmbeddedTypeDecode<S>,
         body: (d: TypedDecoder<S>) => R): R
     {
@@ -314,10 +323,10 @@ export class Decoder<T = never> implements TypedDecoder<T> {
         });
     }
 
-    nextEmbedded(): Embedded<T> | undefined {
+    nextEmbedded(): T | undefined {
         return this.skipAnnotations((reset) => {
             switch (this.state.nextbyte()) {
-                case Tag.Embedded: return embed(this.embeddedDecode.decode(this.state));
+                case Tag.Embedded: return this.embeddedDecode.decode(this.state);
                 default: return reset();
             }
         });
@@ -386,11 +395,16 @@ export class Decoder<T = never> implements TypedDecoder<T> {
     }
 }
 
-export function decode<T>(bs: BytesLike, options: DecoderEmbeddedOptions<T> = {}): Value<T> {
+export function decode<T extends Embeddable>(
+    bs: BytesLike,
+    options: DecoderEmbeddedOptions<T> = {},
+): Value<T> {
     return new Decoder(bs, options).next();
 }
 
-export function decodeWithAnnotations<T>(bs: BytesLike,
-                                         options: DecoderEmbeddedOptions<T> = {}): Annotated<T> {
+export function decodeWithAnnotations<T extends Embeddable>(
+    bs: BytesLike,
+    options: DecoderEmbeddedOptions<T> = {},
+): Annotated<T> {
     return decode(bs, { ... options, includeAnnotations: true }) as Annotated<T>;
 }

implementations/javascript/packages/core/src/dictionary.ts

@@ -1,19 +1,22 @@
 import { Encoder, canonicalString } from "./encoder";
 import { Tag } from "./constants";
-import { FlexMap, FlexSet, _iterMap, IdentitySet } from "./flex";
+import { FlexMap, FlexSet, _iterMap, IdentitySet, Equivalence, IsMap } from "./flex";
 import { Value } from "./values";
 import { Bytes } from './bytes';
-import { GenericEmbedded } from "./embedded";
+import { Embeddable, GenericEmbedded, isEmbedded } from "./embedded";
 import type { Preservable } from "./encoder";
 import type { Writer, PreserveWritable } from "./writer";
 import { annotations, Annotated } from "./annotated";
+import { Float } from "./float";
+import { JsDictionary } from "./jsdictionary";
+import { unannotate } from "./strip";
 
 export type DictionaryType = 'Dictionary' | 'Set';
 export const DictionaryType = Symbol.for('DictionaryType');
 
-export type CompoundKey<T> = Value<T> | (Preservable<T> & PreserveWritable<T>);
+export type CompoundKey<T extends Embeddable> = Value<T> | (Preservable<T> & PreserveWritable<T>);
 
-export class EncodableDictionary<K, V, T = GenericEmbedded> extends FlexMap<K, V>
+export class EncodableDictionary<T extends Embeddable, K, V> extends FlexMap<K, V>
     implements Preservable<T>, PreserveWritable<T>
 {
     constructor(
@@ -39,16 +42,16 @@ export class EncodableDictionary<K, V, T = GenericEmbedded> extends FlexMap<K, V
     }
 }
 
-export class KeyedDictionary<K extends CompoundKey<T>, V, T = GenericEmbedded>
-    extends EncodableDictionary<K, V, T>
+export class KeyedDictionary<T extends Embeddable = GenericEmbedded, K extends CompoundKey<T> = Value<T>, V = Value<T>>
+    extends EncodableDictionary<T, K, V>
 {
     get [DictionaryType](): DictionaryType {
         return 'Dictionary';
     }
 
-    static isKeyedDictionary<K extends CompoundKey<T>, V, T = GenericEmbedded>(
+    static isKeyedDictionary<T extends Embeddable = GenericEmbedded, K extends CompoundKey<T> = Value<T>, V = Value<T>>(
         x: any,
-    ): x is KeyedDictionary<K, V, T> {
+    ): x is KeyedDictionary<T, K, V> {
         return x?.[DictionaryType] === 'Dictionary';
     }
 
@@ -58,33 +61,204 @@ export class KeyedDictionary<K extends CompoundKey<T>, V, T = GenericEmbedded>
         super(k => k, v => v as CompoundKey<T>, items);
     }
 
-    mapEntries<W, S extends Value<R>, R = GenericEmbedded>(f: (entry: [K, V]) => [S, W]): KeyedDictionary<S, W, R> {
-        const result = new KeyedDictionary<S, W, R>();
-        for (let oldEntry of this.entries()) {
-            const newEntry = f(oldEntry);
-            result.set(newEntry[0], newEntry[1])
-        }
-        return result;
-    }
-
-    clone(): KeyedDictionary<K, V, T> {
+    clone(): KeyedDictionary<T, K, V> {
         return new KeyedDictionary(this);
     }
 
     get [Symbol.toStringTag]() { return 'Dictionary'; }
+
+    equals(otherAny: any, eqv: Equivalence<V> = (v1, v2) => v1 === v2): boolean {
+        const otherMap = Dictionary.asMap(otherAny);
+        if (!otherMap) return false;
+        return super.equals(otherMap, eqv);
+    }
 }
 
-export class Dictionary<T = GenericEmbedded, V = Value<T>> extends KeyedDictionary<Value<T>, V, T> {
-    static isDictionary<T = GenericEmbedded, V = Value<T>>(x: any): x is Dictionary<T, V> {
-        return x?.[DictionaryType] === 'Dictionary';
+export type Dictionary<T extends Embeddable = GenericEmbedded, V = Value<T>> =
+    JsDictionary<V> | KeyedDictionary<T, Value<T>, V>;
+
+export class DictionaryMap<T extends Embeddable = GenericEmbedded, V = Value<T>> implements Map<Value<T>, V> {
+    get [IsMap](): boolean { return true; }
+
+    j: JsDictionary<V> | undefined;
+    k: KeyedDictionary<T, Value<T>, V> | undefined;
+
+    constructor(input?: Dictionary<T, V>) {
+        if (input === void 0) {
+            this.j = {};
+            this.k = void 0;
+        } else if (DictionaryType in input) {
+            this.j = void 0;
+            this.k = input;
+        } else {
+            this.j = input;
+            this.k = void 0;
+        }
     }
 
-    static __from_preserve__<T>(v: Value<T>): undefined | Dictionary<T> {
+    static from<T extends Embeddable = GenericEmbedded, V = Value<T>>(
+        entries: [Value<T>, V][] | Iterable<[Value<T>, V]>,
+    ): DictionaryMap<T, V> {
+        const r = new DictionaryMap<T, V>();
+        for (const [key, value] of entries) r.set(key, value);
+        return r;
+    }
+
+    clear(): void {
+        if (this.j) {
+            JsDictionary.clear(this.j);
+        } else {
+            this.k!.clear();
+        }
+    }
+
+    delete(key: Value<T>): boolean {
+        if (this.j) {
+            key = unannotate(key);
+            if (typeof key !== 'symbol') return false;
+            return JsDictionary.remove(this.j, key);
+        } else {
+            return this.k!.delete(key);
+        }
+    }
+
+    forEach(callbackfn: (value: V, key: Value<T>, map: Map<Value<T>, V>) => void, thisArg?: any): void {
+        if (this.j) {
+            JsDictionary.forEach(this.j, (v, k) => callbackfn.call(thisArg, v, k, this));
+        } else {
+            this.k!.forEach(callbackfn, thisArg);
+        }
+    }
+
+    get(key: Value<T>): V | undefined {
+        if (this.j) {
+            key = unannotate(key);
+            if (typeof key !== 'symbol') return void 0;
+            return JsDictionary.get(this.j, key);
+        } else {
+            return this.k!.get(key);
+        }
+    }
+
+    has(key: Value<T>): boolean {
+        if (this.j) {
+            key = unannotate(key);
+            if (typeof key !== 'symbol') return false;
+            return JsDictionary.has(this.j, key);
+        } else {
+            return this.k!.has(key);
+        }
+    }
+
+    set(key: Value<T>, value: V): this {
+        if (this.j) {
+            if (typeof key === 'symbol') {
+                JsDictionary.set(this.j, key, value);
+                return this;
+            }
+            this.k = new KeyedDictionary<T, Value<T>, V>(JsDictionary.entries(this.j));
+            this.j = void 0;
+        }
+        this.k!.set(key, value);
+        return this;
+    }
+
+    get size(): number {
+        return this.j ? JsDictionary.size(this.j) : this.k!.size;
+    }
+
+    entries(): IterableIterator<[Value<T>, V]> {
+        return this.j ? JsDictionary.entries(this.j) : this.k!.entries();
+    }
+
+    keys(): IterableIterator<Value<T>> {
+        return this.j ? JsDictionary.keys(this.j) : this.k!.keys();
+    }
+
+    values(): IterableIterator<V> {
+        return this.j ? JsDictionary.values(this.j) : this.k!.values();
+    }
+
+    [Symbol.iterator](): IterableIterator<[Value<T>, V]> {
+        return this.entries();
+    }
+
+    get [Symbol.toStringTag](): string {
+        return 'DictionaryMap';
+    }
+
+    clone(): DictionaryMap<T, V> {
+        return new DictionaryMap<T, V>(this.j ? JsDictionary.clone(this.j) : this.k!.clone());
+    }
+
+    get value(): Dictionary<T, V> {
+        return this.j ?? this.k!;
+    }
+
+    simplify(): void {
+        if (!this.j) {
+            const r: JsDictionary<V> = {};
+            for (const [key, value] of this.k!.entries()) {
+                if (typeof key !== 'symbol') return;
+                r[key.description!] = value;
+            }
+            this.j = r;
+            this.k = void 0;
+        }
+    }
+
+    simplifiedValue(): Dictionary<T, V> {
+        this.simplify();
+        return this.value;
+    }
+
+    asJsDictionary(): JsDictionary<V> {
+        this.simplify();
+        if (!this.j) throw new Error("Cannot represent general dictionary as JsDictionary");
+        return this.j;
+    }
+
+    asKeyedDictionary(): KeyedDictionary<T, Value<T>, V> {
+        return this.k ?? new KeyedDictionary<T, Value<T>, V>(JsDictionary.entries(this.j!));
+    }
+}
+
+export namespace Dictionary {
+    export function isDictionary<T extends Embeddable = GenericEmbedded, V = Value<T>>(
+        x: any
+    ): x is Dictionary<T, V> {
+        if (typeof x !== 'object' || x === null) return false;
+        switch (x[DictionaryType]) {
+            case 'Dictionary': return true;
+            case void 0: return JsDictionary.isJsDictionary(x);
+            default: return false;
+        }
+    }
+
+    export function asMap<T extends Embeddable = GenericEmbedded, V = Value<T>>(
+        x: Dictionary<T, V>
+    ): DictionaryMap<T, V>;
+    export function asMap<T extends Embeddable = GenericEmbedded, V = Value<T>>(
+        x: any
+    ): DictionaryMap<T, V> | undefined;
+    export function asMap<T extends Embeddable = GenericEmbedded, V = Value<T>>(
+        x: any
+    ): DictionaryMap<T, V> | undefined {
+        return isDictionary<T, V>(x) ? new DictionaryMap(x) : void 0;
+    }
+
+    export function from<T extends Embeddable = GenericEmbedded, V = Value<T>>(
+        entries: [Value<T>, V][] | Iterable<[Value<T>, V]>,
+    ): Dictionary<T, V> {
+        return DictionaryMap.from(entries).simplifiedValue();
+    }
+
+    export function __from_preserve__<T extends Embeddable>(v: Value<T>): undefined | Dictionary<T> {
         return Dictionary.isDictionary<T>(v) ? v : void 0;
     }
 }
 
-export function encodeDictionaryOn<K, V, T>(
+export function encodeDictionaryOn<T extends Embeddable, K, V>(
     dict: Map<K, V>,
     encoder: Encoder<T>,
     encodeK: (k: K, encoder: Encoder<T>) => void,
@@ -114,7 +288,7 @@ export function encodeDictionaryOn<K, V, T>(
     }
 }
 
-export function writeDictionaryOn<K, V, T>(
+export function writeDictionaryOn<T extends Embeddable, K, V>(
     dict: Map<K, V>,
     w: Writer<T>,
     writeK: (k: K, w: Writer<T>) => void,
@@ -135,7 +309,7 @@ export function writeDictionaryOn<K, V, T>(
     });
 }
 
-export class EncodableSet<V, T = GenericEmbedded> extends FlexSet<V>
+export class EncodableSet<T extends Embeddable, V> extends FlexSet<V>
     implements Preservable<T>, PreserveWritable<T>
 {
     constructor(
@@ -154,16 +328,16 @@ export class EncodableSet<V, T = GenericEmbedded> extends FlexSet<V>
     }
 }
 
-export class KeyedSet<K extends CompoundKey<T>, T = GenericEmbedded>
-    extends EncodableSet<K, T>
+export class KeyedSet<T extends Embeddable = GenericEmbedded, K extends CompoundKey<T> = Value<T>>
+    extends EncodableSet<T, K>
 {
     get [DictionaryType](): DictionaryType {
         return 'Set';
     }
 
-    static isKeyedSet<K extends CompoundKey<T>, T = GenericEmbedded>(
+    static isKeyedSet<T extends Embeddable = GenericEmbedded, K extends CompoundKey<T> = Value<T>>(
         x: any,
-    ): x is KeyedSet<K, T> {
+    ): x is KeyedSet<T, K> {
         return x?.[DictionaryType] === 'Set';
     }
 
@@ -171,34 +345,36 @@ export class KeyedSet<K extends CompoundKey<T>, T = GenericEmbedded>
         super(k => k, items);
     }
 
-    map<S extends Value<R>, R = GenericEmbedded>(f: (value: K) => S): KeyedSet<S, R> {
+    map<R extends Embeddable = GenericEmbedded, S extends Value<R> = Value<R>>(
+        f: (value: K) => S,
+    ): KeyedSet<R, S> {
         return new KeyedSet(_iterMap(this[Symbol.iterator](), f));
     }
 
-    filter(f: (value: K) => boolean): KeyedSet<K, T> {
-        const result = new KeyedSet<K, T>();
+    filter(f: (value: K) => boolean): KeyedSet<T, K> {
+        const result = new KeyedSet<T, K>();
         for (let k of this) if (f(k)) result.add(k);
         return result;
     }
 
-    clone(): KeyedSet<K, T> {
+    clone(): KeyedSet<T, K> {
         return new KeyedSet(this);
     }
 
     get [Symbol.toStringTag]() { return 'Set'; }
 }
 
-export class Set<T = GenericEmbedded> extends KeyedSet<Value<T>, T> {
-    static isSet<T = GenericEmbedded>(x: any): x is Set<T> {
+export class Set<T extends Embeddable = GenericEmbedded> extends KeyedSet<T> {
+    static isSet<T extends Embeddable = GenericEmbedded>(x: any): x is Set<T> {
         return x?.[DictionaryType] === 'Set';
     }
 
-    static __from_preserve__<T>(v: Value<T>): undefined | Set<T> {
+    static __from_preserve__<T extends Embeddable>(v: Value<T>): undefined | Set<T> {
         return Set.isSet<T>(v) ? v : void 0;
     }
 }
 
-export function encodeSetOn<V, T>(
+export function encodeSetOn<T extends Embeddable, V>(
     s: IdentitySet<V>,
     encoder: Encoder<T>,
     encodeV: (v: V, encoder: Encoder<T>) => void,
@@ -219,7 +395,7 @@ export function encodeSetOn<V, T>(
     }
 }
 
-export function writeSetOn<V, T>(
+export function writeSetOn<T extends Embeddable, V>(
     s: IdentitySet<V>,
     w: Writer<T>,
     writeV: (v: V, w: Writer<T>) => void,

implementations/javascript/packages/core/src/embedded.ts

@@ -3,7 +3,17 @@ import type { EncoderState } from "./encoder";
 import type { Value } from "./values";
 import { ReaderStateOptions } from "./reader";
 
-export type EmbeddedTypeEncode<T> = {
+export const IsEmbedded = Symbol.for('IsEmbedded');
+
+export interface Embeddable {
+    readonly [IsEmbedded]: true;
+}
+
+export function isEmbedded<T extends Embeddable>(v: any): v is T {
+    return !!v?.[IsEmbedded];
+}
+
+export type EmbeddedTypeEncode<T extends Embeddable> = {
     encode(s: EncoderState, v: T): void;
 }
 
@@ -12,46 +22,22 @@ export type EmbeddedTypeDecode<T> = {
     fromValue(v: Value<GenericEmbedded>, options: ReaderStateOptions): T;
 }
 
-export type EmbeddedType<T> = EmbeddedTypeEncode<T> & EmbeddedTypeDecode<T>;
+export type EmbeddedType<T extends Embeddable> = EmbeddedTypeEncode<T> & EmbeddedTypeDecode<T>;
 
 export class Embedded<T> {
-    embeddedValue: T;
+    get [IsEmbedded](): true { return true; }
 
-    constructor(embeddedValue: T) {
-        this.embeddedValue = embeddedValue;
+    constructor(public readonly value: T) {}
+
+    equals(other: any): boolean {
+        return typeof other === 'object' && 'value' in other && Object.is(this.value, other.value);
     }
-
-    equals(other: any, is: (a: any, b: any) => boolean) {
-        return isEmbedded<T>(other) && is(this.embeddedValue, other.embeddedValue);
-    }
-
-    toString(): string {
-        return '#:' + (this.embeddedValue as any).toString();
-    }
-
-    __as_preserve__<R>(): T extends R ? Value<R> : never {
-        return this as any;
-    }
-
-    static __from_preserve__<T>(v: Value<T>): undefined | Embedded<T> {
-        return isEmbedded<T>(v) ? v : void 0;
-    }
-}
-
-export function embed<T>(embeddedValue: T): Embedded<T> {
-    return new Embedded(embeddedValue);
-}
-
-export function isEmbedded<T>(v: Value<T>): v is Embedded<T> {
-    return typeof v === 'object' && 'embeddedValue' in v;
 }
 
 export class GenericEmbedded {
-    generic: Value;
+    get [IsEmbedded](): true { return true; }
 
-    constructor(generic: Value) {
-        this.generic = generic;
-    }
+    constructor(public readonly generic: Value) {}
 
     equals(other: any, is: (a: any, b: any) => boolean) {
         return typeof other === 'object' && 'generic' in other && is(this.generic, other.generic);

implementations/javascript/packages/core/src/encoder.ts

@@ -3,17 +3,18 @@ import { Bytes, unhexDigit } from "./bytes";
 import { Value } from "./values";
 import { EncodeError } from "./codec";
 import { Record, Tuple } from "./record";
-import { EmbeddedTypeEncode } from "./embedded";
-import type { Embedded } from "./embedded";
+import { EmbeddedTypeEncode, isEmbedded } from "./embedded";
+import type { Embeddable } from "./embedded";
+import { DictionaryMap, encodeDictionaryOn } from "./dictionary";
 
-export type Encodable<T> =
+export type Encodable<T extends Embeddable> =
     Value<T> | Preservable<T> | Iterable<Value<T>> | ArrayBufferView;
 
-export interface Preservable<T> {
+export interface Preservable<T extends Embeddable> {
     __preserve_on__(encoder: Encoder<T>): void;
 }
 
-export function isPreservable<T>(v: any): v is Preservable<T> {
+export function isPreservable<T extends Embeddable>(v: any): v is Preservable<T> {
     return typeof v === 'object' && v !== null && '__preserve_on__' in v && typeof v.__preserve_on__ === 'function';
 }
 
@@ -22,11 +23,11 @@ export interface EncoderOptions {
     includeAnnotations?: boolean;
 }
 
-export interface EncoderEmbeddedOptions<T> extends EncoderOptions {
+export interface EncoderEmbeddedOptions<T extends Embeddable> extends EncoderOptions {
     embeddedEncode?: EmbeddedTypeEncode<T>;
 }
 
-export function asLatin1(bs: Uint8Array): string {
+function asLatin1(bs: Uint8Array): string {
     return String.fromCharCode.apply(null, bs as any as number[]);
 }
 
@@ -199,7 +200,7 @@ export class EncoderState {
     }
 }
 
-export class Encoder<T = object> {
+export class Encoder<T extends Embeddable> {
     state: EncoderState;
     embeddedEncode: EmbeddedTypeEncode<T>;
 
@@ -218,7 +219,7 @@ export class Encoder<T = object> {
         }
     }
 
-    withEmbeddedEncode<S>(
+    withEmbeddedEncode<S extends Embeddable>(
         embeddedEncode: EmbeddedTypeEncode<S>,
         body: (e: Encoder<S>) => void): this
     {
@@ -249,7 +250,7 @@ export class Encoder<T = object> {
     }
 
     push(v: Encodable<T>) {
-        if (isPreservable<unknown>(v)) {
+        if (isPreservable<any>(v)) {
             v.__preserve_on__(this);
         }
         else if (isPreservable<T>(v)) {
@@ -288,17 +289,21 @@ export class Encoder<T = object> {
                 for (let i of v) this.push(i);
             });
         }
+        else if (isEmbedded<T>(v)) {
+            this.state.emitbyte(Tag.Embedded);
+            this.embeddedEncode.encode(this.state, v);
+        }
         else {
-            ((v: Embedded<T>) => {
-                this.state.emitbyte(Tag.Embedded);
-                this.embeddedEncode.encode(this.state, v.embeddedValue);
-            })(v);
+            encodeDictionaryOn(new DictionaryMap<T>(v),
+                               this,
+                               (k, e) => e.push(k),
+                               (v, e) => e.push(v));
         }
         return this; // for chaining
     }
 }
 
-export function encode<T>(
+export function encode<T extends Embeddable>(
     v: Encodable<T>,
     options: EncoderEmbeddedOptions<T> = {}): Bytes
 {
@@ -332,7 +337,9 @@ export function canonicalString(v: Encodable<any>): string {
     }
 }
 
-export function encodeWithAnnotations<T>(v: Encodable<T>,
-                                         options: EncoderEmbeddedOptions<T> = {}): Bytes {
+export function encodeWithAnnotations<T extends Embeddable>(
+    v: Encodable<T>,
+    options: EncoderEmbeddedOptions<T> = {},
+): Bytes {
     return encode(v, { ... options, includeAnnotations: true });
 }

implementations/javascript/packages/core/src/float.ts

@@ -1,6 +1,6 @@
 import { Tag } from "./constants";
 import { Value } from "./values";
-import type { GenericEmbedded } from "./embedded";
+import type { Embeddable, GenericEmbedded } from "./embedded";
 import type { Encoder, Preservable } from "./encoder";
 import type { Writer, PreserveWritable } from "./writer";
 import { Bytes, dataview } from "./bytes";
@@ -93,7 +93,7 @@ export function floatlikeString(f: number): string {
 // }
 
 export class DoubleFloat extends Float implements Preservable<any>, PreserveWritable<any> {
-    __as_preserve__<T = GenericEmbedded>(): Value<T> {
+    __as_preserve__<T extends Embeddable = GenericEmbedded>(): Value<T> {
         return this;
     }
 
@@ -101,7 +101,7 @@ export class DoubleFloat extends Float implements Preservable<any>, PreserveWrit
         return new DoubleFloat(dataview(bs).getFloat64(0, false));
     }
 
-    static __from_preserve__<T>(v: Value<T>): undefined | DoubleFloat {
+    static __from_preserve__<T extends Embeddable>(v: Value<T>): undefined | DoubleFloat {
         return Float.isDouble(v) ? v : void 0;
     }
 

implementations/javascript/packages/core/src/fold.ts

@@ -1,10 +1,10 @@
 import { Record, Tuple } from "./record";
 import { Bytes } from "./bytes";
 import { Value } from "./values";
-import { Set, Dictionary } from "./dictionary";
+import { Set, KeyedDictionary, Dictionary, DictionaryMap } from "./dictionary";
 import { annotate, Annotated } from "./annotated";
 import { Double, Float } from "./float";
-import { Embedded } from "./embedded";
+import { Embeddable, isEmbedded } from "./embedded";
 
 export enum ValueClass {
     Boolean,
@@ -21,9 +21,9 @@ export enum ValueClass {
     Annotated, // quasi-class
 }
 
-export type Fold<T, R = Value<T>> = (v: Value<T>) => R;
+export type Fold<T extends Embeddable, R = Value<T>> = (v: Value<T>) => R;
 
-export interface FoldMethods<T, R> {
+export interface FoldMethods<T extends Embeddable, R> {
     boolean(b: boolean): R;
     double(f: number): R;
     integer(i: number | bigint): R;
@@ -34,39 +34,39 @@ export interface FoldMethods<T, R> {
     record(r: Record<Value<T>, Tuple<Value<T>>, T>, k: Fold<T, R>): R;
     array(a: Array<Value<T>>, k: Fold<T, R>): R;
     set(s: Set<T>, k: Fold<T, R>): R;
-    dictionary(d: Dictionary<T>, k: Fold<T, R>): R;
+    dictionary(d: DictionaryMap<T>, k: Fold<T, R>): R;
 
     annotated(a: Annotated<T>, k: Fold<T, R>): R;
 
-    embedded(t: Embedded<T>, k: Fold<T, R>): R;
+    embedded(t: T, k: Fold<T, R>): R;
 }
 
-export class VoidFold<T> implements FoldMethods<T, void> {
-    boolean(b: boolean): void {}
-    double(f: number): void {}
-    integer(i: number | bigint): void {}
-    string(s: string): void {}
-    bytes(b: Bytes): void {}
-    symbol(s: symbol): void {}
+export class VoidFold<T extends Embeddable> implements FoldMethods<T, void> {
+    boolean(_b: boolean): void {}
+    double(_f: number): void {}
+    integer(_i: number | bigint): void {}
+    string(_s: string): void {}
+    bytes(_b: Bytes): void {}
+    symbol(_s: symbol): void {}
     record(r: Record<Value<T>, Tuple<Value<T>>, T>, k: Fold<T, void>): void {
         k(r.label);
         r.forEach(k);
     }
     array(a: Value<T>[], k: Fold<T, void>): void { a.forEach(k); }
     set(s: Set<T>, k: Fold<T, void>): void { s.forEach(k); }
-    dictionary(d: Dictionary<T>, k: Fold<T, void>): void {
+    dictionary(d: DictionaryMap<T>, k: Fold<T, void>): void {
         d.forEach((value, key) => { k(key); k(value); });
     }
     annotated(a: Annotated<T>, k: Fold<T, void>): void { k(a.item); a.annotations.forEach(k); }
-    embedded(_t: Embedded<T>, _k: Fold<T, void>): void {}
+    embedded(_t: T, _k: Fold<T, void>): void {}
 }
 
-export class ForEachEmbedded<T> extends VoidFold<T> {
+export class ForEachEmbedded<T extends Embeddable> extends VoidFold<T> {
     constructor(public readonly f: (t: T, k: Fold<T, void>) => void) { super(); }
-    embedded(t: Embedded<T>, k: Fold<T, void>): void { this.f(t.embeddedValue, k); }
+    embedded(t: T, k: Fold<T, void>): void { this.f(t, k); }
 }
 
-export abstract class ValueFold<T, R = T> implements FoldMethods<T, Value<R>> {
+export abstract class ValueFold<T extends Embeddable, R extends Embeddable = T> implements FoldMethods<T, Value<R>> {
     boolean(b: boolean): Value<R> {
         return b;
     }
@@ -94,22 +94,24 @@ export abstract class ValueFold<T, R = T> implements FoldMethods<T, Value<R>> {
     set(s: Set<T>, k: Fold<T, Value<R>>): Value<R> {
         return s.map(k);
     }
-    dictionary(d: Dictionary<T>, k: Fold<T, Value<R>>): Value<R> {
-        return d.mapEntries(([key, value]) => [k(key), k(value)]);
+    dictionary(d: DictionaryMap<T>, k: Fold<T, Value<R>>): Value<R> {
+        const result = new DictionaryMap<R>();
+        d.forEach((value, key) => result.set(k(key), k(value)));
+        return result.simplifiedValue();
     }
     annotated(a: Annotated<T>, k: Fold<T, Value<R>>): Value<R> {
         return annotate(k(a.item), ...a.annotations.map(k));
     }
-    abstract embedded(t: Embedded<T>, k: Fold<T, Value<R>>): Value<R>;
+    abstract embedded(t: T, k: Fold<T, Value<R>>): Value<R>;
 }
 
-export class IdentityFold<T> extends ValueFold<T, T> {
-    embedded(t: Embedded<T>, _k: Fold<T, Value<T>>): Value<T> {
+export class IdentityFold<T extends Embeddable> extends ValueFold<T, T> {
+    embedded(t: T, _k: Fold<T, Value<T>>): Value<T> {
         return t;
     }
 }
 
-export class MapFold<T, R> extends ValueFold<T, R> {
+export class MapFold<T extends Embeddable, R extends Embeddable> extends ValueFold<T, R> {
     readonly f: (t: T) => Value<R>;
 
     constructor(f: (t: T) => Value<R>) {
@@ -117,12 +119,12 @@ export class MapFold<T, R> extends ValueFold<T, R> {
         this.f = f;
     }
 
-    embedded(t: Embedded<T>, _k: Fold<T, Value<R>>): Value<R> {
-        return this.f(t.embeddedValue);
+    embedded(t: T, _k: Fold<T, Value<R>>): Value<R> {
+        return this.f(t);
     }
 }
 
-export function valueClass<T>(v: Value<T>): ValueClass {
+export function valueClass<T extends Embeddable>(v: Value<T>): ValueClass {
     switch (typeof v) {
         case 'boolean':
             return ValueClass.Boolean;
@@ -154,7 +156,7 @@ export function valueClass<T>(v: Value<T>): ValueClass {
             } else if (Float.isDouble(v)) {
                 return ValueClass.Double;
             } else {
-                return ValueClass.Embedded;
+                return ((_v: T) => ValueClass.Embedded)(v);
             }
         default:
             ((_v: never): never => { throw new Error("Internal error"); })(v);
@@ -163,7 +165,7 @@ export function valueClass<T>(v: Value<T>): ValueClass {
 
 export const IDENTITY_FOLD = new IdentityFold<any>();
 
-export function fold<T, R>(v: Value<T>, o: FoldMethods<T, R>): R {
+export function fold<T extends Embeddable, R>(v: Value<T>, o: FoldMethods<T, R>): R {
     const walk = (v: Value<T>): R => {
         switch (typeof v) {
             case 'boolean':
@@ -188,16 +190,16 @@ export function fold<T, R>(v: Value<T>, o: FoldMethods<T, R>): R {
                     return o.array(v, walk);
                 } else if (Set.isSet<T>(v)) {
                     return o.set(v, walk);
-                } else if (Dictionary.isDictionary<T>(v)) {
-                    return o.dictionary(v, walk);
+                } else if (isEmbedded(v)) {
+                    return o.embedded(v, walk);
                 } else if (Annotated.isAnnotated<T>(v)) {
                     return o.annotated(v, walk);
                 } else if (Bytes.isBytes(v)) {
                     return o.bytes(v);
                 } else if (Float.isDouble(v)) {
                     return o.double(v.value);
-                } else {
-                    return o.embedded(v, walk);
+                } else if (Dictionary.isDictionary<T>(v)) {
+                    return o.dictionary(new DictionaryMap(v), walk);
                 }
             default:
                 ((_v: never): never => { throw new Error("Internal error"); })(v);
@@ -206,7 +208,7 @@ export function fold<T, R>(v: Value<T>, o: FoldMethods<T, R>): R {
     return walk(v);
 }
 
-export function mapEmbeddeds<T, R>(
+export function mapEmbeddeds<T extends Embeddable, R extends Embeddable>(
     v: Value<T>,
     f: (t: T) => Value<R>,
 ): Value<R>
@@ -214,6 +216,9 @@ export function mapEmbeddeds<T, R>(
     return fold(v, new MapFold(f));
 }
 
-export function forEachEmbedded<T>(v: Value<T>, f: (t: T, k: Fold<T, void>) => void): void {
+export function forEachEmbedded<T extends Embeddable>(
+    v: Value<T>,
+    f: (t: T, k: Fold<T, void>) => void,
+): void {
     return fold(v, new ForEachEmbedded(f));
 }

implementations/javascript/packages/core/src/fromjs.ts

@@ -1,72 +1,97 @@
-import { embed, GenericEmbedded } from "./embedded";
+import { Embeddable, GenericEmbedded, isEmbedded } from "./embedded";
 import { Bytes } from "./bytes";
 import { Record, Tuple } from "./record";
 import { Value } from "./values";
-import { Dictionary, Set } from "./dictionary";
+import { Dictionary, KeyedDictionary, Set } from "./dictionary";
+import { JsDictionary } from "./jsdictionary";
 
-export function fromJS<T = GenericEmbedded>(x: any): Value<T> {
-    switch (typeof x) {
-        case 'number':
-            if (!Number.isInteger(x)) {
-                // We require that clients be explicit about integer vs. non-integer types.
-                throw new TypeError("Refusing to autoconvert non-integer number to Double");
-            }
+export interface FromJSOptions<T extends Embeddable = GenericEmbedded> {
+    onNonInteger?(n: number): Value<T> | undefined;
+}
+
+export function fromJS<T extends Embeddable = GenericEmbedded>(x: any): Value<T> {
+    return fromJS_options(x);
+}
+
+export function fromJS_options<T extends Embeddable = GenericEmbedded>(x: any, options?: FromJSOptions<T>): Value<T> {
+    function walk(x: any): Value<T> {
+        switch (typeof x) {
+            case 'number':
+                if (!Number.isInteger(x)) {
+                    // We require that clients be explicit about integer vs. non-integer types.
+                    const converted = options?.onNonInteger?.(x) ?? void 0;
+                    if (converted !== void 0) return converted;
+                    throw new TypeError("Refusing to autoconvert non-integer number to Double");
+                }
             // FALL THROUGH
-        case 'bigint':
-        case 'string':
-        case 'symbol':
-        case 'boolean':
-            return x;
-
-        case 'undefined':
-        case 'function':
-            break;
-
-        case 'object':
-            if (x === null) {
-                break;
-            }
-            if (typeof x.__as_preserve__ === 'function') {
-                return x.__as_preserve__();
-            }
-            if (Record.isRecord<Value<T>, Tuple<Value<T>>, T>(x)) {
+            case 'bigint':
+            case 'string':
+            case 'symbol':
+            case 'boolean':
                 return x;
-            }
-            if (Array.isArray(x)) {
-                return x.map<Value<T>>(fromJS);
-            }
-            if (ArrayBuffer.isView(x) || x instanceof ArrayBuffer) {
-                return Bytes.from(x);
-            }
-            if (Map.isMap(x)) {
-                const d = new Dictionary<T>();
-                x.forEach((v, k) => d.set(fromJS(k), fromJS(v)));
-                return d;
-            }
-            if (Set.isSet(x)) {
-                const s = new Set<T>();
-                x.forEach(v => s.add(fromJS(v)));
-                return s;
-            }
-            // Just... assume it's a T.
-            return embed(x as T);
 
-        default:
-            break;
+            case 'undefined':
+            case 'function':
+                break;
+
+            case 'object':
+                if (x === null) {
+                    break;
+                }
+                if (typeof x.__as_preserve__ === 'function') {
+                    return x.__as_preserve__();
+                }
+                if (Record.isRecord<Value<T>, Tuple<Value<T>>, T>(x)) {
+                    return x;
+                }
+                if (Array.isArray(x)) {
+                    return x.map<Value<T>>(walk);
+                }
+                if (ArrayBuffer.isView(x) || x instanceof ArrayBuffer) {
+                    return Bytes.from(x);
+                }
+                if (Map.isMap(x)) {
+                    const d = new KeyedDictionary<T>();
+                    x.forEach((v, k) => d.set(walk(k), walk(v)));
+                    return d;
+                }
+                if (Set.isSet(x)) {
+                    const s = new Set<T>();
+                    x.forEach(v => s.add(walk(v)));
+                    return s;
+                }
+                if (isEmbedded<T>(x)) {
+                    return x;
+                }
+                // Handle plain JS objects to build a JsDictionary
+                {
+                    const r: JsDictionary<Value<T>> = {};
+                    Object.entries(x).forEach(([k, v]) => r[k] = walk(v));
+                    return r;
+                }
+
+            default:
+                break;
+        }
+
+        throw new TypeError("Cannot represent JavaScript value as Preserves: " + x);
     }
 
-    throw new TypeError("Cannot represent JavaScript value as Preserves: " + x);
+    return walk(x);
 }
 
 declare module "./dictionary" {
     namespace Dictionary {
-        export function fromJS<T = GenericEmbedded, V = GenericEmbedded>(x: object): Dictionary<T, Value<V>>;
+        export function stringMap<T extends Embeddable = GenericEmbedded>(
+            x: object
+        ): KeyedDictionary<T, string, Value<T>>;
     }
 }
 
-Dictionary.fromJS = function <T = GenericEmbedded, V = GenericEmbedded>(x: object): Dictionary<T, Value<V>> {
-    if (Dictionary.isDictionary<T, Value<V>>(x)) return x;
-    const d = new Dictionary<T, Value<V>>();
-    Object.entries(x).forEach(([key, value]) => d.set(key, fromJS(value)));
-    return d;
+Dictionary.stringMap = function <T extends Embeddable = GenericEmbedded>(
+    x: object
+): KeyedDictionary<T, string, Value<T>> {
+    const r = new KeyedDictionary<T, string, Value<T>>();
+    Object.entries(x).forEach(([key, value]) => r.set(key, fromJS(value)));
+    return r;
 };

implementations/javascript/packages/core/src/index.ts

@@ -1,15 +1,17 @@
 export * from './runtime';
 export * as Constants from './constants';
+export * as Pexpr from './pexpr';
 
+import type { Embeddable } from './embedded';
 import type { Value } from './values';
 
 declare global {
     interface ArrayConstructor {
-        __from_preserve__<T>(v: Value<T>): undefined | Array<Value<T>>;
+        __from_preserve__<T extends Embeddable>(v: Value<T>): undefined | Array<Value<T>>;
     }
 }
 
-Array.__from_preserve__ = <T>(v: Value<T>) => {
+Array.__from_preserve__ = <T extends Embeddable>(v: Value<T>) => {
     return Array.isArray(v) ? v : void 0;
 };
 

implementations/javascript/packages/core/src/is.ts

@@ -1,9 +1,10 @@
-import type { GenericEmbedded } from "./embedded";
+import type { Embeddable, GenericEmbedded } from "./embedded";
 import type { Annotated } from "./annotated";
+import { Dictionary } from "./dictionary";
 
 export const IsPreservesAnnotated = Symbol.for('IsPreservesAnnotated');
 
-export function isAnnotated<T = GenericEmbedded>(x: any): x is Annotated<T>
+export function isAnnotated<T extends Embeddable = GenericEmbedded>(x: any): x is Annotated<T>
 {
     return !!x?.[IsPreservesAnnotated];
 }
@@ -30,6 +31,17 @@ export function is(a: any, b: any): boolean {
             for (let i = 0; i < a.length; i++) if (!is(a[i], b[i])) return false;
             return true;
         }
+        {
+            const aMap = Dictionary.asMap(a);
+            const bMap = Dictionary.asMap(b);
+            if (!aMap || !bMap) return false;
+            if (aMap.size !== bMap.size) return false;
+            for (const k of aMap.keys()) {
+                if (!bMap.has(k)) return false;
+                if (!is(aMap.get(k), bMap.get(k))) return false;
+            }
+            return true;
+        }
     }
     return false;
 }

implementations/javascript/packages/core/src/jsdictionary.ts

@@ -0,0 +1,89 @@
+import { isEmbedded } from './embedded';
+import { Equivalence, _iterMap } from './flex';
+
+export interface JsDictionary<V> {
+    [key: string]: V;
+}
+
+export namespace JsDictionary {
+    export function isJsDictionary<V>(x: any): x is JsDictionary<V> {
+        // We accept only literal objects and objects created via `new Object` as dictionaries.
+        // Furthermore, we require no function-valued `__as_preserve__` property to exist.
+        return typeof x === 'object'
+            && x !== null
+            && Object.getPrototypeOf(Object.getPrototypeOf(x)) === null
+            && typeof x.__as_preserve__ !== 'function'
+            && !isEmbedded(x);
+    }
+
+    export function from<V>(entries: Iterable<[symbol, V]>): JsDictionary<V> {
+        const r: JsDictionary<V> = {};
+        for (const [key, value] of entries) r[key.description!] = value;
+        return r;
+    }
+
+    export function clear<V>(j: JsDictionary<V>): void {
+        for (const key in j) delete j[key];
+    }
+
+    export function remove<V>(j: JsDictionary<V>, key: symbol): boolean {
+        const result = has(j, key);
+        delete j[key.description!];
+        return result;
+    }
+
+    export function forEach<V>(
+        j: JsDictionary<V>,
+        callbackfn: (value: V, key: symbol) => void,
+    ): void {
+        Object.entries(j).forEach(([key, val]) => callbackfn(val, Symbol.for(key)));
+    }
+
+    export function get<V>(j: JsDictionary<V>, key: symbol): V | undefined {
+        return j[key.description!];
+    }
+
+    export function has<V>(j: JsDictionary<V>, key: symbol): boolean {
+        return Object.hasOwnProperty.call(j, key.description!);
+    }
+
+    export function set<V>(j: JsDictionary<V>, key: symbol, value: V): JsDictionary<V> {
+        j[key.description!] = value;
+        return j;
+    }
+
+    export function size<V>(j: JsDictionary<V>): number {
+        return Object.keys(j).length;
+    }
+
+    export function entries<V>(j: JsDictionary<V>): IterableIterator<[symbol, V]> {
+        return _iterMap(Object.entries(j).values(), ([k, v]) => [Symbol.for(k), v]);
+    }
+
+    export function keys<V>(j: JsDictionary<V>): IterableIterator<symbol> {
+        return _iterMap(Object.keys(j).values(), k => Symbol.for(k));
+    }
+
+    export function values<V>(j: JsDictionary<V>): IterableIterator<V> {
+        return Object.values(j).values();
+    }
+
+    export function clone<V>(j: JsDictionary<V>): JsDictionary<V> {
+        const r: JsDictionary<V> = {};
+        Object.keys(j).forEach(k => r[k] = j[k]);
+        return r;
+    }
+
+    export function equals<V>(
+        j1: JsDictionary<V>,
+        j2: JsDictionary<V>,
+        eqv: Equivalence<V> = (v1, v2) => v1 === v2,
+    ): boolean {
+        if (size(j1) !== size(j2)) return false;
+        for (let [k, v] of entries(j1)) {
+            if (!has(j2, k)) return false;
+            if (!eqv(v, get(j2, k)!)) return false;
+        }
+        return true;
+    }
+}

implementations/javascript/packages/core/src/merge.ts

@@ -3,13 +3,15 @@ import { Bytes } from "./bytes";
 import { fold } from "./fold";
 import { is } from "./is";
 import { Value } from "./values";
-import { Set, Dictionary } from "./dictionary";
+import { Set, Dictionary, KeyedDictionary, DictionaryMap } from "./dictionary";
 import { Annotated } from "./annotated";
 import { unannotate } from "./strip";
-import { embed, isEmbedded, Embedded } from "./embedded";
+import { isEmbedded } from "./embedded";
 import { isCompound } from "./compound";
+import type { Embeddable } from "./embedded";
+import { JsDictionary } from "./jsdictionary";
 
-export function merge<T>(
+export function merge<T extends Embeddable>(
     mergeEmbeddeds: (a: T, b: T) => T | undefined,
     item0: Value<T>,
     ... items: Array<Value<T>>): Value<T>
@@ -42,33 +44,38 @@ export function merge<T>(
                 if (!Record.isRecord<Value<T>, Tuple<Value<T>>, T>(b)) die();
                 return Record(walk(r.label, b.label), walkMany(r, b));
             },
+
             array(a: Array<Value<T>>) {
                 if (!Array.isArray(b) || Record.isRecord(b)) die();
                 return walkMany(a, b);
             },
+
             set(_s: Set<T>) { die(); },
-            dictionary(d: Dictionary<T>) {
-                if (!Dictionary.isDictionary<T>(b)) die();
-                const r = new Dictionary<T>();
-                d.forEach((av,ak) => {
-                    const bv = b.get(ak);
+
+            dictionary(aMap: DictionaryMap<T>) {
+                const bMap = Dictionary.asMap<T>(b);
+                if (bMap === void 0) die();
+
+                const r = new DictionaryMap<T>();
+                aMap.forEach((av,ak) => {
+                    const bv = bMap.get(ak);
                     r.set(ak, bv === void 0 ? av : walk(av, bv));
                 });
-                b.forEach((bv, bk) => {
-                    if (!d.has(bk)) r.set(bk, bv);
+                bMap.forEach((bv, bk) => {
+                    if (!aMap.has(bk)) r.set(bk, bv);
                 });
-                return r;
+                return r.simplifiedValue();
             },
 
             annotated(a: Annotated<T>) {
                 return walk(a, unannotate(b));
             },
 
-            embedded(t: Embedded<T>) {
+            embedded(t: T) {
                 if (!isEmbedded<T>(b)) die();
-                const r = mergeEmbeddeds(t.embeddedValue, b.embeddedValue);
+                const r = mergeEmbeddeds(t, b);
                 if (r === void 0) die();
-                return embed(r);
+                return r;
             },
         });
     }

implementations/javascript/packages/core/src/node_support.ts

@@ -2,12 +2,12 @@
 
 import { Annotated } from './annotated';
 import { Bytes } from './bytes';
-import { Set, Dictionary } from './dictionary';
+import { Set, EncodableDictionary } from './dictionary';
 import { stringify } from './text';
 
 import * as util from 'util';
 
-[Bytes, Annotated, Set, Dictionary].forEach((C) => {
+[Bytes, Annotated, Set, EncodableDictionary].forEach((C) => {
     (C as any).prototype[util.inspect.custom] =
         function (_depth: any, _options: any) {
             return stringify(this, { indent: 2 });

implementations/javascript/packages/core/src/order.ts

@@ -1,13 +1,14 @@
 import { is, isAnnotated } from './is';
 import { Bytes } from './bytes';
 import { Set, Dictionary } from './dictionary';
-import { Embedded, isEmbedded } from './embedded';
+import { isEmbedded } from './embedded';
 import { Float } from './float';
 import { Value } from './values';
 import { Record } from './record';
+import type { Embeddable } from './embedded';
 
-export function typeCode<V>(v: Value<V>): number {
-    if (isAnnotated<V>(v)) v = v.item;
+export function typeCode<T extends Embeddable>(v: Value<T>): number {
+    if (isAnnotated<T>(v)) v = v.item;
     switch (typeof v) {
         case 'boolean':
             return 0;
@@ -24,23 +25,23 @@ export function typeCode<V>(v: Value<V>): number {
             if (Array.isArray(v)) {
                 return ('label' in v) ? 7 : 8;
             }
-            if (Set.isSet<V>(v)) return 9;
-            if (Dictionary.isDictionary<V>(v)) return 10;
+            if (Set.isSet<T>(v)) return 9;
+            if (Dictionary.isDictionary<T>(v)) return 10;
             if (isEmbedded(v)) return 11;
             /* fall through */
         default:
-            throw new Error("Invalid Value<V> in typeCode");
+            throw new Error("Invalid Value<T> in typeCode");
     }
 }
 
-export function compare<V>(
-    a: Value<V>,
-    b: Value<V>,
-    compare_embedded: (a: V, b: V) => number = (a, b) => is(a, b) ? 0 : a < b ? -1 : 1,
+export function compare<T extends Embeddable>(
+    a: Value<T>,
+    b: Value<T>,
+    compare_embedded: (a: T, b: T) => number = (a, b) => is(a, b) ? 0 : a < b ? -1 : 1,
 ): number {
-    function cmp(a: Value<V>, b: Value<V>): number {
-        if (isAnnotated<V>(a)) a = a.item;
-        if (isAnnotated<V>(b)) b = b.item;
+    function cmp(a: Value<T>, b: Value<T>): number {
+        if (isAnnotated<T>(a)) a = a.item;
+        if (isAnnotated<T>(b)) b = b.item;
         const ta = typeCode(a);
         const tb = typeCode(b);
         if (ta < tb) return -1;
@@ -67,14 +68,14 @@ export function compare<V>(
                 return va < vb ? -1 : va > vb ? 1 : 0;
             }
             case 7: {
-                const lr = cmp((a as Record<Value<V>, Value<V>[], V>).label,
-                               (b as Record<Value<V>, Value<V>[], V>).label);
+                const lr = cmp((a as Record<Value<T>, Value<T>[], T>).label,
+                               (b as Record<Value<T>, Value<T>[], T>).label);
                 if (lr !== 0) return lr;
                 /* fall through */
             }
             case 8: {
-                const va = a as Value<V>[];
-                const vb = b as Value<V>[];
+                const va = a as Value<T>[];
+                const vb = b as Value<T>[];
                 const l = Math.min(va.length, vb.length)
                 for (let i = 0; i < l; i++) {
                     const c = cmp(va[i], vb[i]);
@@ -83,18 +84,17 @@ export function compare<V>(
                 return va.length < vb.length ? -1 : va.length > vb.length ? 1 : 0;
             }
             case 9: {
-                const va = Array.from(a as Set<V>).sort(cmp);
-                const vb = Array.from(b as Set<V>).sort(cmp);
+                const va = Array.from(a as Set<T>).sort(cmp);
+                const vb = Array.from(b as Set<T>).sort(cmp);
                 return cmp(va, vb);
             }
             case 10: {
-                const va = Array.from(a as Dictionary<V>).sort(cmp);
-                const vb = Array.from(b as Dictionary<V>).sort(cmp);
+                const va = Array.from(Dictionary.asMap<T>(a)!.entries()).sort(cmp);
+                const vb = Array.from(Dictionary.asMap<T>(b)!.entries()).sort(cmp);
                 return cmp(va, vb);
             }
             case 11:
-                return compare_embedded((a as Embedded<V>).embeddedValue,
-                                        (b as Embedded<V>).embeddedValue);
+                return compare_embedded(a as T, b as T);
             default:
                 throw new Error("Invalid typeCode: " + ta);
         }

implementations/javascript/packages/core/src/pexpr.ts

@@ -0,0 +1,353 @@
+// Preserves-Expressions. https://preserves.dev/preserves-expressions.html
+
+import { ReaderBase } from './reader';
+import { Atom, Value } from './values';
+import { Position, annotate, formatPosition } from './annotated';
+import { Record as VRecord } from './record';
+import { Embeddable, GenericEmbedded } from './embedded';
+import { fromJS } from './fromjs';
+import { DictionaryMap, Set as VSet } from './dictionary';
+
+export type Expr = SimpleExpr | Punct;
+export type SimpleExpr = Atom | Compound | Embedded;
+
+export type Positioned<I> = { position: Position, item: I, annotations?: Annotations };
+
+export class Punct {
+    constructor(public text: string) {}
+    __as_preserve__(): Value { return VRecord(Symbol.for('p'), [Symbol.for(this.text)]); }
+
+    isComma(): boolean { return this.text === ','; }
+    static isComma(v: Expr): boolean { return v instanceof Punct && v.isComma(); }
+
+    isColon(n = 1): boolean { return this.text === ':'.repeat(n); }
+    static isColon(v: Expr, n = 1): boolean { return v instanceof Punct && v.isColon(n); }
+}
+
+export class Embedded {
+    constructor(public expr: SimpleExpr, public annotations?: Annotations) {}
+    __as_preserve__(): Value {
+        const v = fromJS(this.expr);
+        return new GenericEmbedded(this.annotations?.wrap(v) ?? v);
+    }
+}
+
+export class BaseCompound<I> {
+    positions: Position[] = [];
+    exprs: I[] = [];
+    annotations?: Annotations[] = void 0; // sparse array when non-void
+
+    get(i: number): Positioned<I> | undefined {
+        if (i >= this.exprs.length) return void 0;
+        return {
+            position: this.positions[i],
+            item: this.exprs[i],
+            annotations: this.annotations && this.annotations[i],
+        };
+    }
+
+    push(p: Positioned<I>): true;
+    push(expr: I, position: Position, annotations?: Annotations): true;
+    push(v: Positioned<I> | I, position?: Position, annotations?: Annotations) {
+        if (position === void 0) {
+            const p = v as Positioned<I>;
+            if (p.annotations) this._ensureAnnotations()[this.exprs.length] = p.annotations;
+            this.positions.push(p.position);
+            this.exprs.push(p.item);
+        } else {
+            if (annotations) this._ensureAnnotations()[this.exprs.length] = annotations;
+            this.positions.push(position);
+            this.exprs.push(v as I);
+        }
+        return true;
+    }
+
+    _ensureAnnotations(): Annotations[] {
+        if (this.annotations === void 0) this.annotations = [];
+        return this.annotations;
+    }
+
+    _annotationsAt(index: number): Annotations {
+        return this._ensureAnnotations()[index] ??= new Annotations();
+    }
+
+    preservesValues(): Value[] {
+        return this.exprs.map((p, i) => {
+            const v = fromJS(p);
+            if (this.annotations?.[i] !== void 0) {
+                return this.annotations[i].wrap(v);
+            } else {
+                return v;
+            }
+        });
+    }
+
+    __as_preserve__(): Value {
+        return this.preservesValues();
+    }
+
+    map<R>(f: (item: Positioned<I>, index: number) => R, offset = 0): R[] {
+        const result: R[] = [];
+        for (let i = offset; i < this.exprs.length; i++) {
+            result.push(f(this.get(i)!, i));
+        }
+        return result;
+    }
+
+    [Symbol.iterator](): IterableIterator<Positioned<I>> {
+        let c = this;
+        let i = 0;
+        return {
+            next(): IteratorResult<Positioned<I>> {
+                if (i < c.exprs.length) {
+                    return { done: false, value: c.get(i++)! };
+                } else {
+                    return { done: true, value: void 0 };
+                }
+            },
+            [Symbol.iterator]() { return c[Symbol.iterator](); }
+        };
+    }
+}
+
+export class Document extends BaseCompound<Expr> {}
+
+export class Annotations extends BaseCompound<SimpleExpr> {
+    wrap(v: Value): Value {
+        return annotate(v, ... this.preservesValues());
+    }
+}
+
+export type CompoundVariant = 'sequence' | 'record' | 'block' | 'group' | 'set';
+
+export abstract class Compound extends BaseCompound<Expr> {
+    abstract get variant(): CompoundVariant;
+    __as_preserve__(): Value {
+        const vs = this.preservesValues();
+        switch (this.variant) {
+            case 'sequence': return vs;
+            case 'record': return VRecord(Symbol.for('r'), vs);
+            case 'block': return VRecord(Symbol.for('b'), vs);
+            case 'group': return VRecord(Symbol.for('g'), vs);
+            case 'set': return VRecord(Symbol.for('s'), vs);
+        }
+    }
+}
+
+export class Sequence extends Compound {
+    get variant(): CompoundVariant { return 'sequence'; }
+}
+
+export class Record extends Compound {
+    get variant(): CompoundVariant { return 'record'; }
+}
+
+export class Block extends Compound {
+    get variant(): CompoundVariant { return 'block'; }
+}
+
+export class Group extends Compound {
+    get variant(): CompoundVariant { return 'group'; }
+}
+
+export class Set extends Compound {
+    get variant(): CompoundVariant { return 'set'; }
+}
+
+export class Reader extends ReaderBase<never> {
+    nextDocument(howMany: 'all' | 'one' = 'all'): Document {
+        const doc = new Document();
+        this.readExpr(doc);
+        if (howMany === 'all') {
+            while (this.readExpr(doc)) {}
+        }
+        return doc;
+    }
+
+    readCompound(c: Compound, terminator: string): Compound {
+        while (this.readExpr(c, terminator)) {}
+        return c;
+    }
+
+    readSimpleExpr(c: BaseCompound<SimpleExpr>): boolean {
+        return this._readInto(c, false);
+    }
+
+    readExpr(c: BaseCompound<Expr>, terminator: string | null = null): boolean {
+        return this._readInto(c as BaseCompound<SimpleExpr> /* yuck */, true, terminator);
+    }
+
+    _checkTerminator(actual: string, expected: string | null, startPos: Position): false {
+        if (actual === expected) return false;
+        this.state.error('Unexpected ' + actual, startPos);
+    }
+
+    _readInto(c: BaseCompound<SimpleExpr>, acceptPunct: boolean, terminator: string | null = null): boolean {
+        while (true) {
+            this.state.skipws();
+            if (this.state.atEnd() && terminator === null) return false;
+            const startPos = this.state.copyPos();
+            const ch = this.state.nextchar();
+            switch (ch) {
+                case '"':
+                    return c.push(this.state.readString('"'), startPos);
+                case '|':
+                    return c.push(Symbol.for(this.state.readString('|')), startPos);
+                case ';':
+                    if (acceptPunct) {
+                        return (c as BaseCompound<Expr>).push(new Punct(';'), startPos);
+                    } else {
+                        this.state.error('Semicolon is not permitted at this location', startPos);
+                    }
+                case '@':
+                    if (!this.readSimpleExpr(c._annotationsAt(c.exprs.length))) {
+                        this.state.error('Missing annotation', startPos);
+                    }
+                    continue;
+                case ':': {
+                    let colons: string = ch;
+                    while (!this.state.atEnd() && this.state.peek() === ':') {
+                        colons = colons + ':';
+                        this.state.advance();
+                    }
+                    if (acceptPunct) {
+                        return (c as BaseCompound<Expr>).push(new Punct(colons), startPos);
+                    } else {
+                        this.state.error('Colons are not permitted at this location', startPos);
+                    }
+                }
+                case '#': {
+                    const ch = this.state.nextchar();
+                    switch (ch) {
+                        case ' ': case '\t': {
+                            const here = this.state.copyPos();
+                            c._annotationsAt(c.exprs.length).push(this.state.readCommentLine(), here);
+                            continue;
+                        }
+                        case '\n': case '\r': {
+                            const here = this.state.copyPos();
+                            c._annotationsAt(c.exprs.length).push('', here);
+                            continue;
+                        }
+                        case '!': {
+                            const here = this.state.copyPos();
+                            const r = new Record();
+                            r.push(Symbol.for('interpreter'), here);
+                            r.push(this.state.readCommentLine(), here);
+                            c._annotationsAt(c.exprs.length).push(r, here);
+                            continue;
+                        }
+                        case 'f': this.state.requireDelimiter('#f'); return c.push(false, startPos);
+                        case 't': this.state.requireDelimiter('#t'); return c.push(true, startPos);
+                        case '{': return c.push(this.readCompound(new Set(), '}'), startPos);
+                        case '"': return c.push(this.state.readLiteralBinary(), startPos);
+                        case 'x': switch (this.state.nextchar()) {
+                            case '"': return c.push(this.state.readHexBinary(), startPos);
+                            case 'd': return c.push(this.state.readHexFloat(), startPos);
+                            default: this.state.error('Invalid #x syntax', startPos);
+                        }
+                        case '[': return c.push(this.state.readBase64Binary(), startPos);
+                        case ':': {
+                            const r = new BaseCompound<SimpleExpr>();
+                            if (!this.readSimpleExpr(r)) return false;
+                            const e = new Embedded(r.exprs[0], r.annotations && r.annotations[0]);
+                            return c.push(e, startPos);
+                        }                            
+                        default:
+                            this.state.error(`Invalid # syntax: ${ch}`, startPos);
+                    }
+                }
+                case '(': return c.push(this.readCompound(new Group(), ')'), startPos);
+                case '<': return c.push(this.readCompound(new Record(), '>'), startPos);
+                case '[': return c.push(this.readCompound(new Sequence(), ']'), startPos);
+                case '{': return c.push(this.readCompound(new Block(), '}'), startPos);
+                case ')': return this._checkTerminator(ch, terminator, startPos);
+                case '>': return this._checkTerminator(ch, terminator, startPos);
+                case ']': return this._checkTerminator(ch, terminator, startPos);
+                case '}': return this._checkTerminator(ch, terminator, startPos);
+                case ',':
+                    if (acceptPunct) {
+                        return (c as BaseCompound<Expr>).push(new Punct(','), startPos);
+                    } else {
+                        this.state.error('Comma is not permitted at this location', startPos);
+                    }
+                default:
+                    return c.push(this.state.readRawSymbolOrNumber(ch), startPos);
+            }
+        }
+    }
+}
+
+export interface AsPreservesOptions<T extends Embeddable> {
+    onGroup?: (g: Positioned<Group>) => Value<T>;
+    onEmbedded?: (e: Positioned<Expr>, walk: (p: Positioned<Expr>) => Value<T>) => Value<T>;
+    error?: (tag: string, position: Position) => Value<T>;
+}
+
+export function asPreserves<T extends Embeddable>(
+    p: Positioned<Expr>,
+    options: AsPreservesOptions<T> = {},
+): Value<T> {
+    const error = options.error ?? ((tag, position) => {
+        throw new Error(formatPosition(position) + ": " + tag);
+    });
+
+    function nonCommas(p: Compound): Positioned<Expr>[] {
+        return Array.from(p).filter(p => !Punct.isComma(p.item));
+    }
+
+    function walk(p: Positioned<Expr>): Value<T> {
+        if (p.item instanceof Punct) {
+            return error('invalid-punctuation', p.position);
+        } else if (p.item instanceof Embedded) {
+            if (options.onEmbedded) {
+                return options.onEmbedded({ position: p.position, item: p.item.expr }, walk);
+            } else {
+                return error('unexpected-embedded', p.position);
+            }
+        } else if (p.item instanceof Compound) {
+            switch (p.item.variant) {
+                case 'sequence':
+                    return nonCommas(p.item).map(walk);
+                case 'record': {
+                    const vs = nonCommas(p.item).map(walk);
+                    if (vs.length < 1) {
+                        return error('invalid-record', p.position);
+                    }
+                    const r = vs.slice(1) as unknown as VRecord<Value<T>, Value<T>[], T>;
+                    r.label = vs[0];
+                    return r;
+                }
+                case 'block': {
+                    const d = new DictionaryMap<T>();
+                    const vs = nonCommas(p.item);
+                    if ((vs.length % 3) !== 0) {
+                        return error('invalid-dictionary', p.position);
+                    }
+                    for (let i = 0; i < vs.length; i += 3) {
+                        if (!Punct.isColon(vs[i + 1].item)) {
+                            return error('missing-colon', vs[i + 1].position);
+                        }
+                        const k = walk(vs[i]);
+                        const v = walk(vs[i + 2]);
+                        d.set(k, v);
+                    }
+                    return d.simplifiedValue();
+                }
+                case 'group': {
+                    if (options.onGroup) {
+                        return options.onGroup(p as Positioned<Group>);
+                    } else {
+                        return error('unexpected-group', p.position);
+                    }
+                }
+                case 'set':
+                    return new VSet(nonCommas(p.item).map(walk));
+            }
+        } else {
+            return p.item;
+        }
+    }
+
+    return walk(p);
+}

implementations/javascript/packages/core/src/reader.ts

@@ -2,15 +2,15 @@
 
 import type { Value } from './values';
 import { DecodeError, ShortPacket } from './codec';
-import { Dictionary, Set } from './dictionary';
+import { Dictionary, DictionaryMap, Set } from './dictionary';
 import { strip } from './strip';
 import { Bytes, unhexDigit } from './bytes';
 import { Decoder, DecoderState, neverEmbeddedTypeDecode } from './decoder';
 import { Record } from './record';
 import { Annotated, newPosition, Position, updatePosition } from './annotated';
-import { Double, DoubleFloat, FloatType } from './float';
+import { Double, DoubleFloat } from './float';
 import { stringify } from './text';
-import { embed, GenericEmbedded, EmbeddedTypeDecode } from './embedded';
+import { Embeddable, GenericEmbedded, EmbeddedTypeDecode } from './embedded';
 
 export interface ReaderStateOptions {
     includeAnnotations?: boolean;
@@ -155,13 +155,15 @@ export class ReaderState {
         this.error(`Delimiter must follow ${prefix}`, this.pos);
     }
 
+    static readonly DELIMITERS = '(){}[]<>";,@#:|';
+
     delimiterFollows(): boolean {
         if (this.atEnd()) return true;
         const ch = this.peek();
-        return ('(){}[]<>";,@#:|'.indexOf(ch) !== -1) || isSpace(ch);
+        return (ReaderState.DELIMITERS.indexOf(ch) !== -1) || isSpace(ch);
     }
 
-    readRawSymbolOrNumber<T>(acc: string): Value<T> {
+    readRawSymbolOrNumber(acc: string): number | bigint | symbol | DoubleFloat {
         while (!this.delimiterFollows()) acc = acc + this.nextchar();
         const m = NUMBER_RE.exec(acc);
         if (m) {
@@ -248,6 +250,16 @@ export class ReaderState {
             'x',
             () => this.readHex2());
     }
+
+    readCommentLine(): string {
+        let acc = '';
+        while (true) {
+            if (this.atEnd()) return acc;
+            const c = this.nextchar();
+            if (c === '\n' || c === '\r') return acc;
+            acc = acc + c;
+        }
+    }
 }
 
 export const genericEmbeddedTypeDecode: EmbeddedTypeDecode<GenericEmbedded> = {
@@ -260,7 +272,7 @@ export const genericEmbeddedTypeDecode: EmbeddedTypeDecode<GenericEmbedded> = {
     },
 };
 
-export class Reader<T> {
+export class ReaderBase<T extends Embeddable> {
     state: ReaderState;
     embeddedType: EmbeddedTypeDecode<T>;
 
@@ -283,17 +295,13 @@ export class Reader<T> {
     write(data: string) {
         this.state.write(data);
     }
+}
+
+export class Reader<T extends Embeddable> extends ReaderBase<T> {
 
     readCommentLine(): Value<T> {
         const startPos = this.state.copyPos();
-        let acc = '';
-        while (true) {
-            const c = this.state.nextchar();
-            if (c === '\n' || c === '\r') {
-                return this.wrap(acc, startPos);
-            }
-            acc = acc + c;
-        }
+        return this.wrap(this.state.readCommentLine(), startPos);
     }
 
     wrap(v: Value<T>, pos: Position): Value<T> {
@@ -344,6 +352,9 @@ export class Reader<T> {
                     switch (c) {
                         case ' ': case '\t': return this.annotateNextWith(this.readCommentLine());
                         case '\n': case '\r': return this.annotateNextWith('');
+                        case '!':
+                            return this.annotateNextWith(
+                                Record(Symbol.for('interpreter'), [this.readCommentLine()]));
                         case 'f': this.state.requireDelimiter('#f'); return false;
                         case 't': this.state.requireDelimiter('#t'); return true;
                         case '{': return this.readSet();
@@ -354,9 +365,9 @@ export class Reader<T> {
                             default: this.state.error('Invalid #x syntax', startPos);
                         }
                         case '[': return this.state.readBase64Binary();
-                        case ':': return embed(this.embeddedType.fromValue(
+                        case ':': return this.embeddedType.fromValue(
                             new Reader<GenericEmbedded>(this.state, genericEmbeddedTypeDecode).next(),
-                            this.state.options));
+                            this.state.options);
                         default:
                             this.state.error(`Invalid # syntax: ${c}`, startPos);
                     }
@@ -395,22 +406,18 @@ export class Reader<T> {
     }
 
     readDictionary(): Dictionary<T> {
-        return this.seq(true,
-                        new Dictionary<T>(),
-                        (k, acc) => {
-                            this.state.skipws();
-                            switch (this.state.peek()) {
-                                case ':':
-                                    if (acc.has(k)) this.state.error(
-                                        `Duplicate key: ${stringify(k)}`, this.state.pos);
-                                    this.state.advance();
-                                    acc.set(k, this.next());
-                                    break;
-                                default:
-                                    this.state.error('Missing key/value separator', this.state.pos);
-                            }
-                        },
-                        '}');
+        return this.seq(true, new DictionaryMap<T>(), (k, acc) => {
+            this.state.skipws();
+            switch (this.state.peek()) {
+                case ':':
+                    this.state.advance();
+                    if (acc.has(k)) this.state.error(`Duplicate key: ${stringify(k)}`, this.state.pos);
+                    acc.set(k, this.next());
+                    break;
+                default:
+                    this.state.error('Missing key/value separator', this.state.pos);
+            }
+        }, '}').simplifiedValue();
     }
 
     readSet(): Set<T> {

implementations/javascript/packages/core/src/record.ts

@@ -1,11 +1,10 @@
-import { GenericEmbedded } from "./embedded";
+import { Embeddable, GenericEmbedded } from "./embedded";
 import { is } from "./is";
 import { Value } from "./values";
-import { Writer } from "./writer";
 
 export type Tuple<T> = Array<T> | [T];
 
-export type Record<LabelType extends Value<T>, FieldsType extends Tuple<Value<T>>, T = GenericEmbedded>
+export type Record<LabelType extends Value<T>, FieldsType extends Tuple<Value<T>>, T extends Embeddable = GenericEmbedded>
     = FieldsType & { label: LabelType };
 
 export type RecordGetters<Fs, R> = {
@@ -15,7 +14,7 @@ export type RecordGetters<Fs, R> = {
 export type CtorTypes<Fs, Names extends Tuple<keyof Fs>> =
     { [K in keyof Names]: Fs[keyof Fs & Names[K]] } & any[];
 
-export interface RecordConstructor<L extends Value<T>, Fs, Names extends Tuple<keyof Fs>, T = GenericEmbedded> {
+export interface RecordConstructor<L extends Value<T>, Fs, Names extends Tuple<keyof Fs>, T extends Embeddable = GenericEmbedded> {
     (...fields: CtorTypes<Fs, Names>): Record<L, CtorTypes<Fs, Names>, T>;
     constructorInfo: RecordConstructorInfo<L, T>;
     isClassOf(v: any): v is Record<L, CtorTypes<Fs, Names>, T>;
@@ -23,7 +22,7 @@ export interface RecordConstructor<L extends Value<T>, Fs, Names extends Tuple<k
     fieldNumbers: { [K in string & keyof Fs]: number };
 };
 
-export interface RecordConstructorInfo<L extends Value<T>, T = GenericEmbedded> {
+export interface RecordConstructorInfo<L extends Value<T>, T extends Embeddable = GenericEmbedded> {
     label: L;
     arity: number;
 }
@@ -48,23 +47,23 @@ export function Record<L, FieldsType extends Tuple<any>>(
 }
 
 export namespace Record {
-    export function isRecord<L extends Value<T>, FieldsType extends Tuple<Value<T>>, T = GenericEmbedded>(x: any): x is Record<L, FieldsType, T> {
+    export function isRecord<L extends Value<T>, FieldsType extends Tuple<Value<T>>, T extends Embeddable = GenericEmbedded>(x: any): x is Record<L, FieldsType, T> {
         return Array.isArray(x) && 'label' in x;
     }
 
-    export function constructorInfo<L extends Value<T>, FieldsType extends Tuple<Value<T>>, T = GenericEmbedded>(
+    export function constructorInfo<L extends Value<T>, FieldsType extends Tuple<Value<T>>, T extends Embeddable = GenericEmbedded>(
         r: Record<L, FieldsType, T>): RecordConstructorInfo<L, T>
     {
         return { label: r.label, arity: r.length };
     }
 
-    export function isClassOf<L extends Value<T>, FieldsType extends Tuple<Value<T>>, T = GenericEmbedded>(
+    export function isClassOf<L extends Value<T>, FieldsType extends Tuple<Value<T>>, T extends Embeddable = GenericEmbedded>(
         ci: RecordConstructorInfo<L, T>, v: any): v is Record<L, FieldsType, T>
     {
         return (Record.isRecord(v)) && is(ci.label, v.label) && (ci.arity === v.length);
     }
 
-    export function makeConstructor<Fs, T = GenericEmbedded>()
+    export function makeConstructor<Fs, T extends Embeddable = GenericEmbedded>()
     : (<L extends Value<T>, Names extends Tuple<keyof Fs>>(label: L, fieldNames: Names) =>
         RecordConstructor<L, Fs, Names, T>)
     {

implementations/javascript/packages/core/src/runtime.ts

@@ -13,6 +13,7 @@ export * from './float';
 export * from './fold';
 export * from './fromjs';
 export * from './is';
+export * from './jsdictionary';
 export * from './merge';
 export * from './order';
 export * from './reader';

implementations/javascript/packages/core/src/strip.ts

@@ -1,18 +1,18 @@
 import { Value } from "./values";
 import { Annotated } from "./annotated";
 import { Record, Tuple } from "./record";
-import { Set, Dictionary } from "./dictionary";
-import type { GenericEmbedded } from "./embedded";
+import { Set, Dictionary, DictionaryMap } from "./dictionary";
+import type { Embeddable, GenericEmbedded } from "./embedded";
 
-export function unannotate<T = GenericEmbedded>(v: Value<T>): Value<T> {
+export function unannotate<T extends Embeddable = GenericEmbedded>(v: Value<T>): Value<T> {
     return Annotated.isAnnotated<T>(v) ? v.item : v;
 }
 
-export function peel<T = GenericEmbedded>(v: Value<T>): Value<T> {
+export function peel<T extends Embeddable = GenericEmbedded>(v: Value<T>): Value<T> {
     return strip(v, 1);
 }
 
-export function strip<T = GenericEmbedded>(
+export function strip<T extends Embeddable = GenericEmbedded>(
     v: Value<T>,
     depth: number = Infinity): Value<T>
 {
@@ -34,7 +34,9 @@ export function strip<T = GenericEmbedded>(
         } else if (Set.isSet<T>(v.item)) {
             return v.item.map(walk);
         } else if (Dictionary.isDictionary<T>(v.item)) {
-            return v.item.mapEntries((e) => [walk(e[0]), walk(e[1])]);
+            const result = new DictionaryMap<T>();
+            new DictionaryMap<T>(v.item).forEach((val, key) => result.set(walk(key), walk(val)));
+            return result.simplifiedValue();
         } else {
             return v.item;
         }

implementations/javascript/packages/core/src/text.ts

@@ -1,4 +1,4 @@
-import { Embedded, GenericEmbedded } from './embedded';
+import { Embeddable, GenericEmbedded, isEmbedded } from './embedded';
 import type { Value } from './values';
 
 import { Annotated } from './annotated';
@@ -8,22 +8,28 @@ import { Writer, WriterOptions, EmbeddedWriter, WriterState } from './writer';
 import { fromJS } from './fromjs';
 import { Reader, ReaderOptions } from './reader';
 
-export function parse<T = GenericEmbedded>(buffer: string, options?: ReaderOptions<T>): Value<T> {
+export function parse<T extends Embeddable = GenericEmbedded>(
+    buffer: string,
+    options?: ReaderOptions<T>,
+): Value<T> {
     return new Reader<T>(buffer, options).next();
 }
 
-export function parseAll<T = GenericEmbedded>(buffer: string, options?: ReaderOptions<T>): Value<T>[] {
+export function parseAll<T extends Embeddable = GenericEmbedded>(
+    buffer: string,
+    options?: ReaderOptions<T>,
+): Value<T>[] {
     return new Reader<T>(buffer, options).readToEnd();
 }
 
-export const stringifyEmbeddedWrite: EmbeddedWriter<any> = {
+export const stringifyEmbeddedWrite = {
     write(s: WriterState, v: any): void {
         if (v instanceof GenericEmbedded) {
             new Writer(s, this).push(v.generic);
         } else {
             try {
                 const j = fromJS(v);
-                if (!(j instanceof Embedded)) {
+                if (!isEmbedded(j)) {
                     new Writer(s, this).push(j);
                     return;
                 }
@@ -37,7 +43,7 @@ export const stringifyEmbeddedWrite: EmbeddedWriter<any> = {
     }
 };
 
-export function stringify<T = GenericEmbedded>(x: any, options?: WriterOptions<T>): string {
+export function stringify<T extends Embeddable = GenericEmbedded>(x: any, options?: WriterOptions<T>): string {
     options = { ... (options ?? {}) };
     options.embeddedWrite = options.embeddedWrite ?? stringifyEmbeddedWrite;
     return Writer.stringify(fromJS<T>(x), options);

implementations/javascript/packages/core/src/values.ts

@@ -3,13 +3,14 @@
 import type { Bytes } from './bytes';
 import type { DoubleFloat } from './float';
 import type { Annotated } from './annotated';
-import type { Set, Dictionary } from './dictionary';
-import type { Embedded, GenericEmbedded } from './embedded';
+import type { JsDictionary } from './jsdictionary';
+import { Set, KeyedDictionary } from './dictionary';
+import type { Embeddable, GenericEmbedded } from './embedded';
 
-export type Value<T = GenericEmbedded> =
+export type Value<T extends Embeddable = GenericEmbedded> =
     | Atom
     | Compound<T>
-    | Embedded<T>
+    | T
     | Annotated<T>;
 export type Atom =
     | boolean
@@ -18,7 +19,7 @@ export type Atom =
     | string
     | Bytes
     | symbol;
-export type Compound<T = GenericEmbedded> =
+export type Compound<T extends Embeddable = GenericEmbedded> =
     | (Array<Value<T>> | [Value<T>]) & { label: Value<T> }
       // ^ expanded from definition of Record<> in record.ts,
       // because if we use Record<Value<T>, Tuple<Value<T>>, T>,
@@ -27,4 +28,7 @@ export type Compound<T = GenericEmbedded> =
       // Value<T> to any.
     | Array<Value<T>>
     | Set<T>
-    | Dictionary<T>;
+      // v Expanded from definition of Dictionary<> in dictionary.ts,
+      // because of circular-use-of-Value<T> issues.
+    | JsDictionary<Value<T>>
+    | KeyedDictionary<T>;

implementations/javascript/packages/core/src/writer.ts

@@ -1,19 +1,20 @@
 import { isAnnotated } from './is';
 import { Record, Tuple } from "./record";
-import type { GenericEmbedded, Embedded, EmbeddedTypeEncode } from "./embedded";
+import { Embeddable, GenericEmbedded, EmbeddedTypeEncode, isEmbedded } from "./embedded";
 import { Encoder, EncoderState } from "./encoder";
 import type { Value } from "./values";
 import { NUMBER_RE } from './reader';
 import { encodeBase64 } from './base64';
+import { DictionaryMap, writeDictionaryOn } from './dictionary';
 
-export type Writable<T> =
+export type Writable<T extends Embeddable> =
     Value<T> | PreserveWritable<T> | Iterable<Value<T>> | ArrayBufferView;
 
-export interface PreserveWritable<T> {
+export interface PreserveWritable<T extends Embeddable> {
     __preserve_text_on__(writer: Writer<T>): void;
 }
 
-export function isPreserveWritable<T>(v: any): v is PreserveWritable<T> {
+export function isPreserveWritable<T extends Embeddable>(v: any): v is PreserveWritable<T> {
     return typeof v === 'object' && v !== null && '__preserve_text_on__' in v && typeof v.__preserve_text_on__ === 'function';
 }
 
@@ -191,7 +192,7 @@ export class WriterState {
         this.pieces.push(buf + '"');
     }
 
-    couldBeFlat<T>(vs: Writable<T>[]): boolean {
+    couldBeFlat<T extends Embeddable>(vs: Writable<T>[]): boolean {
         let seenCompound = false;
         for (let v of vs) {
             if (Array.isArray(v) || Set.isSet(v) || Map.isMap(v)) {
@@ -206,7 +207,7 @@ export class WriterState {
     }
 }
 
-export class Writer<T> {
+export class Writer<T extends Embeddable> {
     state: WriterState;
     embeddedWrite: EmbeddedWriter<T>;
 
@@ -225,7 +226,7 @@ export class Writer<T> {
         }
     }
 
-    static stringify<T>(v: Writable<T>, options?: WriterOptions<T>): string {
+    static stringify<T extends Embeddable>(v: Writable<T>, options?: WriterOptions<T>): string {
         const w = new Writer(options);
         w.push(v);
         return w.contents();
@@ -262,7 +263,10 @@ export class Writer<T> {
                 this.state.pieces.push('' + v);
                 break;
             case 'object':
-                if (isPreserveWritable<unknown>(v)) {
+                if (v === null) {
+                    throw new Error("Cannot encode null in Preserves Writer.push");
+                }
+                else if (isPreserveWritable<any>(v)) {
                     v.__preserve_text_on__(this);
                 }
                 else if (isPreserveWritable<T>(v)) {
@@ -295,16 +299,19 @@ export class Writer<T> {
                 else if (isIterable(v)) {
                     this.state.writeSeq('[', ']', v, vv => this.push(vv));
                 }
-                else {
-                    ((v: Embedded<T>) => {
-                        this.state.pieces.push('#:');
-                        if ('write' in this.embeddedWrite) {
-                            this.embeddedWrite.write(this.state, v.embeddedValue);
-                        } else {
-                            new Writer(this.state, genericEmbeddedTypeEncode)
-                                .push(this.embeddedWrite.toValue(v.embeddedValue));
-                        }
-                    })(v);
+                else if (isEmbedded(v)) {
+                    this.state.pieces.push('#:');
+                    if ('write' in this.embeddedWrite) {
+                        this.embeddedWrite.write(this.state, v);
+                    } else {
+                        new Writer(this.state, genericEmbeddedTypeEncode)
+                            .push(this.embeddedWrite.toValue(v));
+                    }
+                } else {
+                    writeDictionaryOn(new DictionaryMap<T>(v),
+                                      this,
+                                      (k, w) => w.push(k),
+                                      (v, w) => w.push(v));
                 }
                 break;
             default:

implementations/javascript/packages/core/test/bytes.test.ts

@@ -118,3 +118,11 @@ describe('base64 decoder', () => {
         it('gQ==', () => expect(d64('gQ==')).is(Bytes.of(0x81)));
     });
 });
+
+describe('latin1 quasi-decoder', () => {
+    it('decodes ascii', () => expect(Bytes.fromLatin1('abc')).is(Bytes.of(97, 98, 99)));
+    it('encodes ascii', () => expect(Bytes.of(97, 98, 99).toLatin1()).is('abc'));
+    it('decodes unprintables', () => expect(Bytes.fromLatin1('\x00\x01a\xfe\xff')).is(Bytes.of(0, 1, 97, 254, 255)));
+    it('encodes unprintables', () => expect(Bytes.of(0, 1, 97, 254, 255).toLatin1()).is('\x00\x01a\xfe\xff'));
+    it('rejects out-of-bounds', () => expect(() => Bytes.fromLatin1('ac╔b')).toThrowError('Codepoint out of range'));
+});

implementations/javascript/packages/core/test/codec.test.ts

@@ -4,7 +4,6 @@ import {
     decode, decodeWithAnnotations, encode, canonicalEncode,
     DecodeError, ShortPacket,
     Bytes, Record,
-    annotate,
     strip, peel,
     preserves,
     stringify,
@@ -16,11 +15,11 @@ import {
     EmbeddedType,
     DecoderState,
     Decoder,
-    Embedded,
-    embed,
     genericEmbeddedTypeDecode,
     genericEmbeddedTypeEncode,
     parse,
+    Embedded,
+    KeyedDictionary,
 } from '../src/index';
 const { Tag } = Constants;
 import './test-utils';
@@ -78,7 +77,7 @@ describe('parsing from subarray', () => {
 
 describe('reusing buffer space', () => {
     it('should be done safely, even with nested dictionaries', () => {
-        expect(canonicalEncode(fromJS(['aaa', Dictionary.fromJS({a: 1}), 'zzz'])).toHex()).is(
+        expect(canonicalEncode(fromJS(['aaa', Dictionary.stringMap({a: 1}), 'zzz'])).toHex()).is(
             `b5
                b103616161
                b7
@@ -90,33 +89,29 @@ describe('reusing buffer space', () => {
 });
 
 describe('encoding and decoding embeddeds', () => {
-    class LookasideEmbeddedType implements EmbeddedType<object> {
-        readonly objects: object[];
+    class LookasideEmbeddedType implements EmbeddedType<Embedded<object>> {
+        readonly objects: Embedded<object>[];
 
-        constructor(objects: object[]) {
+        constructor(objects: Embedded<object>[]) {
             this.objects = objects;
         }
 
-        decode(d: DecoderState): object {
+        decode(d: DecoderState): Embedded<object> {
             return this.fromValue(new Decoder<GenericEmbedded>(d).next());
         }
 
-        encode(e: EncoderState, v: object): void {
+        encode(e: EncoderState, v: Embedded<object>): void {
             new Encoder(e).push(this.toValue(v));
         }
 
-        equals(a: object, b: object): boolean {
-            return Object.is(a, b);
-        }
-
-        fromValue(v: Value<GenericEmbedded>): object {
+        fromValue(v: Value<GenericEmbedded>): Embedded<object> {
             if (typeof v !== 'number' || v < 0 || v >= this.objects.length) {
-                throw new Error("Unknown embedded target");
+                throw new Error(`Unknown embedded target: ${stringify(v)}`);
             }
             return this.objects[v];
         }
 
-        toValue(v: object): number {
+        toValue(v: Embedded<object>): number {
             let i = this.objects.indexOf(v);
             if (i !== -1) return i;
             this.objects.push(v);
@@ -125,8 +120,8 @@ describe('encoding and decoding embeddeds', () => {
     }
 
     it('should encode using embeddedId when no function has been supplied', () => {
-        const A1 = embed({a: 1});
-        const A2 = embed({a: 1});
+        const A1 = new Embedded({a: 1});
+        const A2 = new Embedded({a: 1});
         const bs1 = canonicalEncode(A1);
         const bs2 = canonicalEncode(A2);
         const bs3 = canonicalEncode(A1);
@@ -143,24 +138,24 @@ describe('encoding and decoding embeddeds', () => {
             .toThrow("Embeddeds not permitted at this point in Preserves document");
     });
     it('should encode properly', () => {
-        const objects: object[] = [];
+        const objects: Embedded<object>[] = [];
         const pt = new LookasideEmbeddedType(objects);
-        const A = embed({a: 1});
-        const B = embed({b: 2});
+        const A = new Embedded({a: 1});
+        const B = new Embedded({b: 2});
         expect(encode([A, B], { embeddedEncode: pt })).is(
             Bytes.from([Tag.Sequence,
                         Tag.Embedded, Tag.SignedInteger, 0,
                         Tag.Embedded, Tag.SignedInteger, 1, 1,
                         Tag.End]));
-        expect(objects).toEqual([A.embeddedValue, B.embeddedValue]);
+        expect(objects).toEqual([A, B]);
     });
     it('should decode properly', () => {
-        const objects: object[] = [];
+        const objects: Embedded<object>[] = [];
         const pt = new LookasideEmbeddedType(objects);
-        const X: Embedded<object> = embed({x: 123});
-        const Y: Embedded<object> = embed({y: 456});
-        objects.push(X.embeddedValue);
-        objects.push(Y.embeddedValue);
+        const X = new Embedded({x: 123});
+        const Y = new Embedded({y: 456});
+        objects.push(X);
+        objects.push(Y);
         expect(decode(Bytes.from([
             Tag.Sequence,
             Tag.Embedded, Tag.SignedInteger, 0,
@@ -169,17 +164,17 @@ describe('encoding and decoding embeddeds', () => {
         ]), { embeddedDecode: pt })).is([X, Y]);
     });
     it('should store embeddeds embedded in map keys correctly', () => {
-        const A1a = {a: 1};
-        const A1: Embedded<object> = embed(A1a);
-        const A2: Embedded<object> = embed({a: 1});
-        const m = new Dictionary<object, number>();
+        const A1a = new Embedded({a: 1});
+        const A1 = A1a;
+        const A2 = new Embedded({a: 1});
+        const m = new KeyedDictionary<Embedded<object>, Value<Embedded<object>>, number>();
         m.set([A1], 1);
         m.set([A2], 2);
         expect(m.get(A1)).toBeUndefined();
         expect(m.get([A1])).toBe(1);
         expect(m.get([A2])).toBe(2);
-        expect(m.get([embed({a: 1})])).toBeUndefined();
-        A1a.a = 3;
+        expect(m.get([{a: 1}])).toBeUndefined();
+        A1a.value.a = 3;
         expect(m.get([A1])).toBe(1);
     });
 });
@@ -309,7 +304,7 @@ describe('common test suite', () => {
 
     const tests = (peel(TestCases._.cases(peel(samples) as TestCases)) as
                    Dictionary<GenericEmbedded>);
-    tests.forEach((t0: Value<GenericEmbedded>, tName0: Value<GenericEmbedded>) => {
+    Dictionary.asMap(tests).forEach((t0, tName0) => {
         const tName = Symbol.keyFor(strip(tName0) as symbol)!;
         const t = peel(t0) as Record<symbol, any, GenericEmbedded>;
         switch (t.label) {

implementations/javascript/packages/core/test/pexpr.test.ts

@@ -0,0 +1,45 @@
+import { Pexpr, Value, fromJS, parse, stringify } from '../src/index';
+import './test-utils';
+
+function P(s: string): Value<any>[] {
+    return parse(s, { includeAnnotations: true });
+}
+
+describe('basics', () => {
+    it('simple example', () => {
+        const r = new Pexpr.Reader('#!foo\n<bar {zot ::quux}, [a; b; c;]>');
+        const d = r.nextDocument();
+        expect(fromJS(d)).is(P(`[\n#!foo\n
+          <r bar <b zot <p |::|> quux> <p |,|> [a <p |;|> b <p |;|> c <p |;|>]>]`));
+    });
+
+    it('simple group', () => {
+        const r = new Pexpr.Reader('(+ 1 2)');
+        expect(fromJS(r.nextDocument())).is(P('[<g + 1 2>]'));
+    });
+
+    it('asPreserves', () => {
+        const s = '{a: b, c: d, e: [1, 2 <r 3 4>]}';
+        const d = new Pexpr.Reader(s).nextDocument();
+        const v = Pexpr.asPreserves(d.get(0)!);
+        expect(v).is(P(s));
+    });
+});
+
+describe('trailing comments', () => {
+    it('basics 1', () => {
+        const d = new Pexpr.Reader('# a comment with nothing after').nextDocument();
+        expect(d.annotations?.[d.exprs.length].get(0)?.item).toBe('a comment with nothing after');
+    });
+
+    it('basics 2', () => {
+        const d = new Pexpr.Reader('# a comment with nothing after\n').nextDocument();
+        expect(d.annotations?.[d.exprs.length].get(0)?.item).toBe('a comment with nothing after');
+    });
+
+    it('inside a sequence', () => {
+        const d = new Pexpr.Reader('[\n1\n# a comment with nothing after\n]\n').nextDocument();
+        const seq = d.get(0)?.item as Pexpr.Compound;
+        expect(seq.annotations?.[seq.exprs.length].get(0)?.item).toBe('a comment with nothing after');
+    });
+});

implementations/javascript/packages/core/test/reader.test.ts

@@ -1,4 +1,4 @@
-import { Bytes, Decoder, genericEmbeddedType, encode, Reader, Double } from '../src/index';
+import { Bytes, Decoder, genericEmbeddedType, encode, Reader, Double, KeyedDictionary, Value } from '../src/index';
 import './test-utils';
 
 import * as fs from 'fs';
@@ -36,4 +36,23 @@ describe('reading common test suite', () => {
         expect(new Reader('123.0').next()).toEqual(Double(123.0));
         expect(new Reader('123.00').next()).toEqual(Double(123.0));
     });
+
+    it('should produce a sensible JS object for symbol-keyed dictionaries', () => {
+        expect(new Reader('{a: 1, b: 2}').next()).toEqual({a: 1, b: 2});
+    });
+
+    it('should produce a sensible dictionary for mixed-keyed dictionaries', () => {
+        expect(new Reader('{a: 1, "b": 2}').next()).is(
+            new KeyedDictionary([[Symbol.for('a'), 1], ["b", 2]] as [Value, Value][]));
+    });
+
+    it('should produce a sensible dictionary for string-keyed dictionaries', () => {
+        expect(new Reader('{"a": 1, "b": 2}').next()).is(
+            new KeyedDictionary([["a", 1], ["b", 2]] as [Value, Value][]));
+    });
+
+    it('should produce a sensible dictionary for integer-keyed dictionaries', () => {
+        expect(new Reader('{9: 1, 8: 2}').next()).is(
+            new KeyedDictionary([[9, 1], [8, 2]] as [Value, Value][]));
+    });
 });

implementations/javascript/packages/core/test/test-utils.ts

@@ -1,10 +1,10 @@
-import { Value, is, preserves } from '../src/index';
+import { Value, is, preserves, Embeddable } from '../src/index';
 import '../src/node_support';
 
 declare global {
     namespace jest {
         interface Matchers<R> {
-            is<T>(expected: Value<T>): R;
+            is<T extends Embeddable>(expected: Value<T>): R;
             toThrowFilter(f: (e: Error) => boolean): R;
         }
     }

implementations/javascript/packages/core/test/values.test.ts

@@ -1,4 +1,4 @@
-import { Double, fromJS, Dictionary, IDENTITY_FOLD, fold, mapEmbeddeds, Value, embed, preserves } from '../src/index';
+import { Double, fromJS, IDENTITY_FOLD, fold, mapEmbeddeds, Value, preserves, KeyedDictionary, Embeddable, Embedded } from '../src/index';
 import './test-utils';
 
 describe('Double', () => {
@@ -8,13 +8,13 @@ describe('Double', () => {
 });
 
 describe('fold', () => {
-    function mkv<T extends object>(t: T): Value<T> {
+    function mkv<T extends Embeddable>(t: T): Value<T> {
         return fromJS<T>([
             1,
             2,
-            new Dictionary([[[3, 4], fromJS([5, 6])],
-                            ['a', 1],
-                            ['b', true]]),
+            new KeyedDictionary<T>([[[3, 4], fromJS([5, 6])],
+                                    ['a', 1],
+                                    ['b', true]]),
             Double(3.4),
             t,
         ]);
@@ -22,12 +22,12 @@ describe('fold', () => {
 
     it('should support identity', () => {
         const w = new Date();
-        const v = mkv(w);
+        const v = mkv(new Embedded(w));
         expect(fold(v, IDENTITY_FOLD)).is(v);
         const w1 = new Date();
-        const v1 = mkv(w1);
+        const v1 = mkv(new Embedded(w1));
         expect(fold(v, IDENTITY_FOLD)).not.is(v1);
-        expect(mapEmbeddeds(v, _t => embed(w1))).is(v1);
+        expect(mapEmbeddeds(v, _t => new Embedded(w1))).is(v1);
     });
 });
 
@@ -69,6 +69,12 @@ describe('is()', () => {
         expect(c).not.toBe(3);
         expect(c).not.is(3);
     });
+    it('should compare equivalent JsDictionary and KeyedDictionary values sensibly', () => {
+        const a = {a: 1, b: 2};
+        const b = new KeyedDictionary(
+            [[Symbol.for('a'), 1], [Symbol.for('b'), 2]] as [Value, Value][]);
+        expect(a).is(b);
+    });
 });
 
 describe('`preserves` formatter', () => {
@@ -82,4 +88,18 @@ describe('`preserves` formatter', () => {
         expect(preserves`>${BigInt("12345678123456781234567812345678")}<`)
             .toBe('>12345678123456781234567812345678<');
     });
+    it('should format regular JS objects', () => {
+        expect(preserves`>${({a: 1, b: 2})}<`)
+            .toBe('>{a: 1 b: 2}<');
+    });
+    it('should format dictionaries with string keys', () => {
+        const v = new KeyedDictionary([["a", 1], ["b", 2]]);
+        expect(preserves`>${v}<`)
+            .toBe('>{"a": 1 "b": 2}<');
+    });
+    it('should format dictionaries with symbol keys', () => {
+        const v = new KeyedDictionary([[Symbol.for("a"), 1], [Symbol.for("b"), 2]]);
+        expect(preserves`>${v}<`)
+            .toBe('>{a: 1 b: 2}<');
+    });
 });

implementations/javascript/packages/schema-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@preserves/schema-cli",
-  "version": "0.994.0",
+  "version": "0.995.206",
   "description": "Command-line tools for Preserves Schema",
   "homepage": "https://gitlab.com/preserves/preserves",
   "license": "Apache-2.0",
@@ -26,8 +26,8 @@
     "@types/minimatch": "^3.0"
   },
   "dependencies": {
-    "@preserves/core": "^0.994.0",
-    "@preserves/schema": "^0.994.0",
+    "@preserves/core": "^0.995.206",
+    "@preserves/schema": "^0.995.206",
     "chalk": "^4.1",
     "chokidar": "^3.5",
     "commander": "^7.2",

implementations/javascript/packages/schema-cli/src/bin/preserves-schemac.ts

@@ -25,7 +25,7 @@ export function run(options: CommandLineArguments): void {
     if (failures.length === 0) {
         if (options.bundle) {
             fs.writeSync(1, underlying(canonicalEncode(M.fromBundle(M.Bundle(
-                new KeyedDictionary<M.ModulePath, M.Schema, M.InputEmbedded>(
+                new KeyedDictionary<M.InputEmbedded, M.ModulePath, M.Schema>(
                     inputFiles.map(i => [i.modulePath, i.schema])))))));
         } else {
             fs.writeSync(1, underlying(canonicalEncode(M.fromSchema(inputFiles[0].schema))));

implementations/javascript/packages/schema/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@preserves/schema",
-  "version": "0.994.0",
+  "version": "0.995.206",
   "description": "Schema support for Preserves data serialization format",
   "homepage": "https://gitlab.com/preserves/preserves",
   "license": "Apache-2.0",
@@ -26,6 +26,10 @@
     "veryclean": "yarn run clean && rm -rf node_modules"
   },
   "dependencies": {
-    "@preserves/core": "^0.994.0"
+    "@preserves/core": "^0.995.206"
+  },
+  "devDependencies": {
+    "@types/js-beautify": "1.14",
+    "js-beautify": "1.15"
   }
 }

implementations/javascript/packages/schema/preserves-schema-browser.js

@@ -68,33 +68,9 @@
       }
     }
 
-    // I.env.forEach((_schema, path) => console.log(PreservesSchema.Meta.formatModulePath(path)));
-
-    for (const [modulePath, schema] of I.env) {
-      let container = Schema;
-      modulePath.slice(0, -1).forEach(n => {
-        if (!(n.description in container)) container[n.description] = {};
-        container = container[n.description];
-      });
-      container[modulePath[modulePath.length - 1].description] = moduleFor(modulePath, schema);
-    }
-
+    I.moduleTree(Schema);
     schemaReady();
   }
 
-  function moduleFor(modulePath, schema) {
-    const { Meta, GenType, Type } = PreservesSchema;
-    const mod = {};
-    schema.definitions.forEach((d, n) => {
-      const definitionName = n.description;
-      const definitionId = Meta.jsId(definitionName);
-      mod[`${definitionId}`] = I.definitionConstructor(modulePath, n);
-      mod[`from${definitionId}`] = I.unparser(modulePath, n);
-      mod[`to${definitionId}`] = v => I.tryParse(modulePath, n, v);
-      mod[`as${definitionId}`] = v => I.parse(modulePath, n, v);
-    });
-    return mod;
-  }
-
   window.addEventListener('DOMContentLoaded', translateScripts);
 })();

implementations/javascript/packages/schema/src/checker.ts

@@ -1,11 +1,11 @@
-import { stringify } from '@preserves/core';
+import { JsDictionary, stringify } from '@preserves/core';
 import * as M from './meta';
 
 export function checkSchema(schema: M.Schema): (
     { ok: true, schema: M.Schema } | { ok: false, problems: Array<string> })
 {
     const checker = new Checker();
-    schema.definitions.forEach(checker.checkDefinition.bind(checker));
+    JsDictionary.forEach(schema.definitions, checker.checkDefinition.bind(checker));
     if (checker.problems.length > 0) {
         return { ok: false, problems: checker.problems };
     } else {

implementations/javascript/packages/schema/src/compiler.ts

@@ -1,4 +1,4 @@
-import { encode, stringify } from "@preserves/core";
+import { encode, JsDictionary, stringify } from "@preserves/core";
 import * as M from "./meta";
 import { CompilerOptions, ModuleContext } from "./compiler/context";
 import { Formatter, block, seq, braces } from "./compiler/block";
@@ -29,7 +29,7 @@ export function compile(
         mod.defineType(seq(`export type _embedded = `, mod.embeddedType, `;`));
     }
 
-    for (const [name, def] of schema.definitions) {
+    for (const [name, def] of JsDictionary.entries(schema.definitions)) {
         const t = typeForDefinition(mod.resolver(), def);
         const nameStr = stringify(name);
         const resultTypeItem = seq(nameStr, mod.genericArgsFor(t));
@@ -49,7 +49,7 @@ export function compile(
         }
     }
 
-    for (const [name0, def] of schema.definitions) {
+    for (const [name0, def] of JsDictionary.entries(schema.definitions)) {
         const t = typeForDefinition(mod.resolver(), def);
         const name = name0 as symbol;
         const nameStr = name0.description!;

implementations/javascript/packages/schema/src/compiler/context.ts

@@ -1,4 +1,4 @@
-import { Dictionary, KeyedSet, FlexSet, Position, stringify } from "@preserves/core";
+import { KeyedSet, FlexSet, Position, stringify, DictionaryMap, JsDictionary } from "@preserves/core";
 import { refPosition } from "../reader";
 import * as M from "../meta";
 import { anglebrackets, block, braces, commas, formatItems, Item, keyvalue, seq } from "./block";
@@ -27,11 +27,11 @@ export class ModuleContext {
     readonly options: CompilerOptions;
     readonly embeddedType: Item;
 
-    readonly literals = new Dictionary<M.InputEmbedded, string>();
+    readonly literals = new DictionaryMap<M.InputEmbedded, string>();
     readonly preamble: Item[] = [];
     readonly typedefs: Item[] = [];
     readonly functiondefs: Item[] = [];
-    readonly imports = new KeyedSet<[M.ModulePath, string, string, string]>();
+    readonly imports = new KeyedSet<M.InputEmbedded, [M.ModulePath, string, string, string]>();
 
     constructor(
         env: M.Environment,
@@ -137,7 +137,7 @@ export class ModuleContext {
                               null,
                               null);
             } else {
-                const p = e.schema.definitions.get(name.name);
+                const p = JsDictionary.get(e.schema.definitions, name.name);
                 if (p !== void 0) {
                     let t = () => typeForDefinition(this.resolver(soughtModule), p);
                     if (name.module.length) {
@@ -158,7 +158,7 @@ export class ModuleContext {
     }
 
     genericParameters(): Item {
-        return anglebrackets(seq('_embedded = ', this.embeddedType));
+        return anglebrackets(seq('_embedded extends _.Embeddable = ', this.embeddedType));
     }
 
     genericParametersFor(t: Type): Item {

implementations/javascript/packages/schema/src/compiler/genconverter.ts

@@ -2,7 +2,7 @@ import { FunctionContext } from "./context";
 import * as M from '../meta';
 import { Item, seq, parens, anglebrackets } from "./block";
 import { simpleType, typeFor } from "./gentype";
-import { ANY_TYPE, Type } from "./type";
+import { ANY_TYPE, isSymbolType, Type } from "./type";
 import { renderType } from "./rendertype";
 
 export function converterForDefinition(
@@ -87,7 +87,7 @@ function converterForTuple(ctx: FunctionContext,
     }
 
     const lengthCheck = variablePattern === void 0
-        ? seq(` && ${src}.length === ${ps.length}`)
+        ? seq(` && ${src}.length >= ${ps.length}`)
         : ((ps.length === 0) ? '' : seq(` && ${src}.length >= ${ps.length}`));
 
     return knownArray
@@ -163,7 +163,7 @@ export function converterForSimple(
             return [seq(`${dest} = `, test, ` ? `, valexp, ` : void 0`)];
         }
         case 'embedded':
-            return [`${dest} = _.isEmbedded<_embedded>(${src}) ? ${src}.embeddedValue : void 0`];
+            return [`${dest} = _.isEmbedded<_embedded>(${src}) ? ${src} : void 0`];
         case 'lit':
             return [`${dest} = _.is(${src}, ${ctx.mod.literal(p.value)}) ? {} : void 0`];
 
@@ -192,7 +192,7 @@ export function converterForSimple(
                         const v = ctx.gentempname();
                         return [
                             seq(`${dest} = new _.EncodableSet`,
-                                anglebrackets(renderType(ctx.mod, vt), '_embedded'),
+                                anglebrackets('_embedded', renderType(ctx.mod, vt)),
                                 parens(encoderForSimplePattern(ctx, p.pattern) ?? `v => v`)),
                             seq(`for (const ${v} of ${src}) `, ctx.block(() => [
                                 ... converterFor(ctx, M.anonymousSimplePattern(p.pattern), v, vv =>
@@ -203,20 +203,30 @@ export function converterForSimple(
         case 'dictof':
             return [`${dest} = void 0`,
                     seq(`if (_.Dictionary.isDictionary<_embedded>(${src})) `, ctx.block(() => {
+                        const srcMap = ctx.gentempname();
                         const resolver = ctx.mod.resolver();
                         const kt = simpleType(resolver, p.key);
                         const vt = simpleType(resolver, p.value);
                         const k = ctx.gentempname();
                         const v = ctx.gentempname();
+                        const symbolKeyed = isSymbolType(kt);
                         return [
-                            seq(`${dest} = new _.EncodableDictionary`,
-                                anglebrackets(renderType(ctx.mod, kt), renderType(ctx.mod, vt), '_embedded'),
-                                parens(encoderForSimplePattern(ctx, p.key) ?? `k => k`,
-                                       encoderForSimplePattern(ctx, p.value) ?? `v => v`)),
-                            seq(`for (const [${k}, ${v}] of ${src}) `, ctx.block(() => [
+                            seq(`const ${srcMap} = new _.DictionaryMap(${src})`),
+                            (symbolKeyed
+                                ? seq(`${dest} = {}`)
+                                : seq(`${dest} = new _.EncodableDictionary`,
+                                      anglebrackets('_embedded', renderType(ctx.mod, kt), renderType(ctx.mod, vt)),
+                                      parens(encoderForSimplePattern(ctx, p.key) ?? `k => k`,
+                                             encoderForSimplePattern(ctx, p.value) ?? `v => v`))),
+                            seq(`for (const [${k}, ${v}] of ${srcMap}) `, ctx.block(() => [
                                 ... converterFor(ctx, M.anonymousSimplePattern(p.key), k, kk =>
                                     converterFor(ctx, M.anonymousSimplePattern(p.value), v, vv =>
-                                        [`${dest}.set(${kk}, ${vv})`, `continue`])),
+                                        [
+                                            (symbolKeyed
+                                                ? `${dest}[${kk}.description!] = ${vv}`
+                                                : `${dest}.set(${kk}, ${vv})`),
+                                            `continue`
+                                        ])),
                                 seq(`${dest} = void 0`),
                                 seq(`break`)]))];
                     }))];
@@ -251,12 +261,13 @@ function converterForCompound(
         case 'tuplePrefix':
             return converterForTuple(ctx, p.fixed, src, knownArray, p.variable, ks);
         case 'dict': {
+            const srcMap = ctx.gentempname();
             const entries = Array.from(p.entries);
             function loop(i: number): Item[] {
                 if (i < entries.length) {
                     const [k, n] = entries[i];
                     const tmpSrc = ctx.gentemp();
-                    return [seq(`if ((${tmpSrc} = ${src}.get(${ctx.mod.literal(k)})) !== void 0) `,
+                    return [seq(`if ((${tmpSrc} = ${srcMap}.get(${ctx.mod.literal(k)})) !== void 0) `,
                                 ctx.block(() =>
                                     converterFor(
                                         ctx,
@@ -267,7 +278,9 @@ function converterForCompound(
                     return ks();
                 }
             }
-            return [seq(`if (_.Dictionary.isDictionary<_embedded>(${src})) `, ctx.block(() => loop(0)))];
+            return [seq(`if (_.Dictionary.isDictionary<_embedded>(${src})) `, ctx.block(() => [
+                seq(`const ${srcMap} = new _.DictionaryMap(${src})`),
+                ... loop(0)]))];
         }
         default:
             ((_p: never) => {})(p);

implementations/javascript/packages/schema/src/compiler/genunconverter.ts

@@ -46,7 +46,7 @@ function unconverterFor(ctx: FunctionContext, p: M.Pattern, src: string): Item {
                     case 'lit':
                         return ctx.mod.literal(p.value);
                     case 'embedded':
-                        return `_.embed(${src})`;
+                        return `${src}`;
                     case 'seqof':
                         return seq(`${src}.map(v => `,
                                    unconverterFor(ctx, M.Pattern.SimplePattern(p.pattern), 'v'),
@@ -57,8 +57,10 @@ function unconverterFor(ctx: FunctionContext, p: M.Pattern, src: string): Item {
                             unconverterFor(ctx, M.Pattern.SimplePattern(p.pattern), 'v'),
                             `)`)));
                     case 'dictof':
-                        return seq(`new _.Dictionary<_embedded>`, parens(seq(
-                            `_.Array.from(${src}.entries()).map(([k, v]) => `,
+                        return seq(`_.Dictionary.from<_embedded>`, parens(seq(
+                            `_.Array.from(`,
+                            M.isSymbolPattern(p.key) ? `_.JsDictionary.entries(${src})` : `${src}.entries()`,
+                            `).map(([k, v]) => `,
                             brackets(
                                 unconverterFor(ctx, M.Pattern.SimplePattern(p.key), 'k'),
                                 unconverterFor(ctx, M.Pattern.SimplePattern(p.value), 'v')),
@@ -95,7 +97,7 @@ function unconverterFor(ctx: FunctionContext, p: M.Pattern, src: string): Item {
                         }
                     }
                     case 'dict':
-                        return seq(`new _.Dictionary<_embedded>`, parens(
+                        return seq(`_.Dictionary.from<_embedded>`, parens(
                             brackets(... Array.from(p.entries.entries()).map(([k, n]) =>
                                 brackets(
                                     ctx.mod.literal(k),

implementations/javascript/packages/schema/src/compiler/rendertype.ts

@@ -1,4 +1,4 @@
-import { SimpleType, Type } from "./type";
+import { isSymbolType, SimpleType, Type } from "./type";
 import { anglebrackets, braces, Item, keyvalue, opseq, seq } from "./block";
 import { ModuleContext } from "./context";
 
@@ -47,12 +47,17 @@ export function renderType(ctxt: ModuleContext, t: Type): Item {
                 return seq(t.typeName, ctxt.genericArgsFor(t));
             }
         case 'set': return seq('_.EncodableSet', anglebrackets(
-            renderType(ctxt, t.type),
-            '_embedded'));
-        case 'dictionary': return seq('_.EncodableDictionary', anglebrackets(
-            renderType(ctxt, t.key),
-            renderType(ctxt, t.value),
-            '_embedded'));
+            '_embedded',
+            renderType(ctxt, t.type)));
+        case 'dictionary':
+            if (isSymbolType(t.key)) {
+                return seq('_.JsDictionary', anglebrackets(renderType(ctxt, t.value)));
+            } else {
+                return seq('_.EncodableDictionary', anglebrackets(
+                    '_embedded',
+                    renderType(ctxt, t.key),
+                    renderType(ctxt, t.value)));
+            }
         case 'array': return seq('Array', anglebrackets(renderType(ctxt, t.type)));
         case 'record': return braces(... simpleTypeFields(ctxt, t));
         default:

implementations/javascript/packages/schema/src/compiler/type.ts

@@ -35,3 +35,7 @@ export namespace Type {
 }
 
 export const ANY_TYPE: FieldType = Type.ref('_.Value', null);
+
+export function isSymbolType(ty: FieldType): ty is { kind: 'ref', typeName: 'symbol', ref: null } {
+    return ty.kind === 'ref' && ty.typeName === 'symbol' && ty.ref === null;
+}

implementations/javascript/packages/schema/src/compiler/value.ts

@@ -1,4 +1,4 @@
-import { Annotated, Bytes, Set, Dictionary, Fold, fold, Record, Tuple, Value, stringify, Embedded } from "@preserves/core";
+import { Annotated, Bytes, Set, Fold, fold, Record, Tuple, Value, stringify, DictionaryMap } from "@preserves/core";
 import { brackets, Item, parens, seq } from "./block";
 import * as M from '../meta';
 
@@ -22,8 +22,8 @@ export function sourceCodeFor(v: Value<M.InputEmbedded>): Item {
         set(s: Set<M.InputEmbedded>, k: Fold<M.InputEmbedded, Item>): Item {
             return seq('new _.Set<_.Value<_embedded>>', parens(brackets(... Array.from(s).map(k))));
         },
-        dictionary(d: Dictionary<M.InputEmbedded>, k: Fold<M.InputEmbedded, Item>): Item {
-            return seq('new _.Dictionary<_embedded>', parens(brackets(... Array.from(d).map(([kk,vv]) =>
+        dictionary(d: DictionaryMap<M.InputEmbedded>, k: Fold<M.InputEmbedded, Item>): Item {
+            return seq('_.Dictionary.from<_embedded>', parens(brackets(... Array.from(d).map(([kk,vv]) =>
                 brackets(k(kk), k(vv))))));
         },
 
@@ -31,7 +31,7 @@ export function sourceCodeFor(v: Value<M.InputEmbedded>): Item {
             return seq('_.annotate<_embedded>', parens(k(a.item), ... a.annotations.map(k)));
         },
 
-        embedded(t: Embedded<M.InputEmbedded>, _k: Fold<M.InputEmbedded, Item>): Item {
+        embedded(t: M.InputEmbedded, _k: Fold<M.InputEmbedded, Item>): Item {
             throw new Error(`Cannot emit source code for construction of embedded ${stringify(t)}`);
         },
     });

implementations/javascript/packages/schema/src/gen/host.ts

@@ -30,14 +30,18 @@ export type Definition = (
     ) &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
 export type Variant = (
     {"label": symbol, "type": Simple} &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
 export type Simple = (
@@ -47,21 +51,27 @@ export type Simple = (
     ) &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
 export type Record = (
     {"fields": Array<NamedField>} &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
 export type NamedField = (
     {"name": symbol, "type": Field} &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
 export type Field = (
@@ -77,7 +87,9 @@ export type Field = (
     ) &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
 
@@ -337,13 +349,13 @@ export namespace Field {
     };
 }
 
-export function asDefinition<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Definition {
+export function asDefinition<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Definition {
     let result = toDefinition(v);
     if (result === void 0) throw new TypeError(`Invalid Definition: ${_.stringify(v)}`);
     return result;
 }
 
-export function toDefinition<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Definition {
+export function toDefinition<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Definition {
     let result: undefined | Definition;
     if (_.Record.isRecord<_.Value<_embedded>, _.Tuple<_.Value<_embedded>>, _embedded>(v)) {
         let _tmp0: ({}) | undefined;
@@ -390,22 +402,22 @@ export function toDefinition<_embedded = _.GenericEmbedded>(v: _.Value<_embedded
 
 export namespace Definition {export const __from_preserve__ = toDefinition;}
 
-export function fromDefinition<_embedded = _.GenericEmbedded>(_v: Definition): _.Value<_embedded> {
+export function fromDefinition<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Definition): _.Value<_embedded> {
     switch (_v._variant) {
         case "union": {return _.Record($union, [_v["variants"].map(v => fromVariant<_embedded>(v))]);};
         case "Simple": {return fromSimple<_embedded>(_v.value);};
     };
 }
 
-export function asVariant<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Variant {
+export function asVariant<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Variant {
     let result = toVariant(v);
     if (result === void 0) throw new TypeError(`Invalid Variant: ${_.stringify(v)}`);
     return result;
 }
 
-export function toVariant<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Variant {
+export function toVariant<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Variant {
     let result: undefined | Variant;
-    if (_.isSequence(v) && v.length === 2) {
+    if (_.isSequence(v) && v.length >= 2) {
         let _tmp0: (symbol) | undefined;
         _tmp0 = typeof v[0] === 'symbol' ? v[0] : void 0;
         if (_tmp0 !== void 0) {
@@ -427,15 +439,15 @@ export function toVariant<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 Variant.__from_preserve__ = toVariant;
 
-export function fromVariant<_embedded = _.GenericEmbedded>(_v: Variant): _.Value<_embedded> {return [_v["label"], fromSimple<_embedded>(_v["type"])];}
+export function fromVariant<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Variant): _.Value<_embedded> {return [_v["label"], fromSimple<_embedded>(_v["type"])];}
 
-export function asSimple<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Simple {
+export function asSimple<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Simple {
     let result = toSimple(v);
     if (result === void 0) throw new TypeError(`Invalid Simple: ${_.stringify(v)}`);
     return result;
 }
 
-export function toSimple<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Simple {
+export function toSimple<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Simple {
     let _tmp0: (Field) | undefined;
     let result: undefined | Simple;
     _tmp0 = toField(v);
@@ -466,20 +478,20 @@ export function toSimple<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 export namespace Simple {export const __from_preserve__ = toSimple;}
 
-export function fromSimple<_embedded = _.GenericEmbedded>(_v: Simple): _.Value<_embedded> {
+export function fromSimple<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Simple): _.Value<_embedded> {
     switch (_v._variant) {
         case "Field": {return fromField<_embedded>(_v.value);};
         case "Record": {return fromRecord<_embedded>(_v.value);};
     };
 }
 
-export function asRecord<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Record {
+export function asRecord<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Record {
     let result = toRecord(v);
     if (result === void 0) throw new TypeError(`Invalid Record: ${_.stringify(v)}`);
     return result;
 }
 
-export function toRecord<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Record {
+export function toRecord<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Record {
     let result: undefined | Record;
     if (_.Record.isRecord<_.Value<_embedded>, _.Tuple<_.Value<_embedded>>, _embedded>(v)) {
         let _tmp0: ({}) | undefined;
@@ -512,17 +524,17 @@ export function toRecord<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 Record.__from_preserve__ = toRecord;
 
-export function fromRecord<_embedded = _.GenericEmbedded>(_v: Record): _.Value<_embedded> {return _.Record($rec, [_v["fields"].map(v => fromNamedField<_embedded>(v))]);}
+export function fromRecord<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Record): _.Value<_embedded> {return _.Record($rec, [_v["fields"].map(v => fromNamedField<_embedded>(v))]);}
 
-export function asNamedField<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): NamedField {
+export function asNamedField<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): NamedField {
     let result = toNamedField(v);
     if (result === void 0) throw new TypeError(`Invalid NamedField: ${_.stringify(v)}`);
     return result;
 }
 
-export function toNamedField<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | NamedField {
+export function toNamedField<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | NamedField {
     let result: undefined | NamedField;
-    if (_.isSequence(v) && v.length === 2) {
+    if (_.isSequence(v) && v.length >= 2) {
         let _tmp0: (symbol) | undefined;
         _tmp0 = typeof v[0] === 'symbol' ? v[0] : void 0;
         if (_tmp0 !== void 0) {
@@ -544,15 +556,15 @@ export function toNamedField<_embedded = _.GenericEmbedded>(v: _.Value<_embedded
 
 NamedField.__from_preserve__ = toNamedField;
 
-export function fromNamedField<_embedded = _.GenericEmbedded>(_v: NamedField): _.Value<_embedded> {return [_v["name"], fromField<_embedded>(_v["type"])];}
+export function fromNamedField<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: NamedField): _.Value<_embedded> {return [_v["name"], fromField<_embedded>(_v["type"])];}
 
-export function asField<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Field {
+export function asField<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Field {
     let result = toField(v);
     if (result === void 0) throw new TypeError(`Invalid Field: ${_.stringify(v)}`);
     return result;
 }
 
-export function toField<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Field {
+export function toField<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Field {
     let _tmp0: ({}) | undefined;
     let result: undefined | Field;
     _tmp0 = _.is(v, $unit) ? {} : void 0;
@@ -687,7 +699,7 @@ export function toField<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): u
 
 export namespace Field {export const __from_preserve__ = toField;}
 
-export function fromField<_embedded = _.GenericEmbedded>(_v: Field): _.Value<_embedded> {
+export function fromField<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Field): _.Value<_embedded> {
     switch (_v._variant) {
         case "unit": {return $unit;};
         case "any": {return $any;};

implementations/javascript/packages/schema/src/gen/schema.ts

@@ -41,16 +41,16 @@ export function _schema() {
 export const _imports = {}
 
 
-export type Bundle<_embedded = _.GenericEmbedded> = (
+export type Bundle<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     {"modules": Modules<_embedded>} &
     _.Preservable<_embedded> &
     _.PreserveWritable<_embedded> &
     {__as_preserve__(): _.Value<_embedded>}
 );
 
-export type Modules<_embedded = _.GenericEmbedded> = _.EncodableDictionary<ModulePath, Schema<_embedded>, _embedded>;
+export type Modules<_embedded extends _.Embeddable = _.GenericEmbedded> = _.EncodableDictionary<_embedded, ModulePath, Schema<_embedded>>;
 
-export type Schema<_embedded = _.GenericEmbedded> = (
+export type Schema<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     {
         "version": Version,
         "embeddedType": EmbeddedTypeName,
@@ -65,19 +65,23 @@ export type Version = (
     {} &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
 export type EmbeddedTypeName = (
     ({"_variant": "false"} | {"_variant": "Ref", "value": Ref}) &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
-export type Definitions<_embedded = _.GenericEmbedded> = _.EncodableDictionary<symbol, Definition<_embedded>, _embedded>;
+export type Definitions<_embedded extends _.Embeddable = _.GenericEmbedded> = _.JsDictionary<Definition<_embedded>>;
 
-export type Definition<_embedded = _.GenericEmbedded> = (
+export type Definition<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     (
         {
             "_variant": "or",
@@ -98,7 +102,7 @@ export type Definition<_embedded = _.GenericEmbedded> = (
     {__as_preserve__(): _.Value<_embedded>}
 );
 
-export type Pattern<_embedded = _.GenericEmbedded> = (
+export type Pattern<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     (
         {"_variant": "SimplePattern", "value": SimplePattern<_embedded>} |
         {"_variant": "CompoundPattern", "value": CompoundPattern<_embedded>}
@@ -108,7 +112,7 @@ export type Pattern<_embedded = _.GenericEmbedded> = (
     {__as_preserve__(): _.Value<_embedded>}
 );
 
-export type SimplePattern<_embedded = _.GenericEmbedded> = (
+export type SimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     (
         {"_variant": "any"} |
         {"_variant": "atom", "atomKind": AtomKind} |
@@ -128,7 +132,7 @@ export type SimplePattern<_embedded = _.GenericEmbedded> = (
     {__as_preserve__(): _.Value<_embedded>}
 );
 
-export type CompoundPattern<_embedded = _.GenericEmbedded> = (
+export type CompoundPattern<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     (
         {
             "_variant": "rec",
@@ -148,7 +152,7 @@ export type CompoundPattern<_embedded = _.GenericEmbedded> = (
     {__as_preserve__(): _.Value<_embedded>}
 );
 
-export type DictionaryEntries<_embedded = _.GenericEmbedded> = _.EncodableDictionary<_.Value<_embedded>, NamedSimplePattern<_embedded>, _embedded>;
+export type DictionaryEntries<_embedded extends _.Embeddable = _.GenericEmbedded> = _.EncodableDictionary<_embedded, _.Value<_embedded>, NamedSimplePattern<_embedded>>;
 
 export type AtomKind = (
     (
@@ -161,17 +165,19 @@ export type AtomKind = (
     ) &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
-export type NamedAlternative<_embedded = _.GenericEmbedded> = (
+export type NamedAlternative<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     {"variantLabel": string, "pattern": Pattern<_embedded>} &
     _.Preservable<_embedded> &
     _.PreserveWritable<_embedded> &
     {__as_preserve__(): _.Value<_embedded>}
 );
 
-export type NamedSimplePattern<_embedded = _.GenericEmbedded> = (
+export type NamedSimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     (
         {"_variant": "named", "value": Binding<_embedded>} |
         {"_variant": "anonymous", "value": SimplePattern<_embedded>}
@@ -181,7 +187,7 @@ export type NamedSimplePattern<_embedded = _.GenericEmbedded> = (
     {__as_preserve__(): _.Value<_embedded>}
 );
 
-export type NamedPattern<_embedded = _.GenericEmbedded> = (
+export type NamedPattern<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     (
         {"_variant": "named", "value": Binding<_embedded>} |
         {"_variant": "anonymous", "value": Pattern<_embedded>}
@@ -191,7 +197,7 @@ export type NamedPattern<_embedded = _.GenericEmbedded> = (
     {__as_preserve__(): _.Value<_embedded>}
 );
 
-export type Binding<_embedded = _.GenericEmbedded> = (
+export type Binding<_embedded extends _.Embeddable = _.GenericEmbedded> = (
     {"name": symbol, "pattern": SimplePattern<_embedded>} &
     _.Preservable<_embedded> &
     _.PreserveWritable<_embedded> &
@@ -202,13 +208,15 @@ export type Ref = (
     {"module": ModulePath, "name": symbol} &
     _.Preservable<any> &
     _.PreserveWritable<any> &
-    {__as_preserve__<_embedded = _.GenericEmbedded>(): _.Value<_embedded>}
+    {
+        __as_preserve__<_embedded extends _.Embeddable = _.GenericEmbedded>(): _.Value<_embedded>
+    }
 );
 
 export type ModulePath = Array<symbol>;
 
 
-export function Bundle<_embedded = _.GenericEmbedded>(modules: Modules<_embedded>): Bundle<_embedded> {
+export function Bundle<_embedded extends _.Embeddable = _.GenericEmbedded>(modules: Modules<_embedded>): Bundle<_embedded> {
     return {
         "modules": modules,
         __as_preserve__() {return fromBundle(this);},
@@ -221,13 +229,13 @@ Bundle.schema = function () {
     return {schema: _schema(), imports: _imports, definitionName: _.Symbol.for("Bundle")};
 }
 
-export function Modules<_embedded = _.GenericEmbedded>(value: _.EncodableDictionary<ModulePath, Schema<_embedded>, _embedded>): Modules<_embedded> {return value;}
+export function Modules<_embedded extends _.Embeddable = _.GenericEmbedded>(value: _.EncodableDictionary<_embedded, ModulePath, Schema<_embedded>>): Modules<_embedded> {return value;}
 
 Modules.schema = function () {
     return {schema: _schema(), imports: _imports, definitionName: _.Symbol.for("Modules")};
 }
 
-export function Schema<_embedded = _.GenericEmbedded>(
+export function Schema<_embedded extends _.Embeddable = _.GenericEmbedded>(
     {version, embeddedType, definitions}: {
         version: Version,
         embeddedType: EmbeddedTypeName,
@@ -296,7 +304,7 @@ export namespace EmbeddedTypeName {
     };
 }
 
-export function Definitions<_embedded = _.GenericEmbedded>(value: _.EncodableDictionary<symbol, Definition<_embedded>, _embedded>): Definitions<_embedded> {return value;}
+export function Definitions<_embedded extends _.Embeddable = _.GenericEmbedded>(value: _.JsDictionary<Definition<_embedded>>): Definitions<_embedded> {return value;}
 
 Definitions.schema = function () {
     return {
@@ -307,7 +315,7 @@ Definitions.schema = function () {
 }
 
 export namespace Definition {
-    export function or<_embedded = _.GenericEmbedded>(
+    export function or<_embedded extends _.Embeddable = _.GenericEmbedded>(
         {pattern0, pattern1, patternN}: {
             pattern0: NamedAlternative<_embedded>,
             pattern1: NamedAlternative<_embedded>,
@@ -332,7 +340,7 @@ export namespace Definition {
             variant: _.Symbol.for("or")
         };
     };
-    export function and<_embedded = _.GenericEmbedded>(
+    export function and<_embedded extends _.Embeddable = _.GenericEmbedded>(
         {pattern0, pattern1, patternN}: {
             pattern0: NamedPattern<_embedded>,
             pattern1: NamedPattern<_embedded>,
@@ -357,7 +365,7 @@ export namespace Definition {
             variant: _.Symbol.for("and")
         };
     };
-    export function Pattern<_embedded = _.GenericEmbedded>(value: Pattern<_embedded>): Definition<_embedded> {
+    export function Pattern<_embedded extends _.Embeddable = _.GenericEmbedded>(value: Pattern<_embedded>): Definition<_embedded> {
         return {
             "_variant": "Pattern",
             "value": value,
@@ -377,7 +385,7 @@ export namespace Definition {
 }
 
 export namespace Pattern {
-    export function SimplePattern<_embedded = _.GenericEmbedded>(value: SimplePattern<_embedded>): Pattern<_embedded> {
+    export function SimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded>(value: SimplePattern<_embedded>): Pattern<_embedded> {
         return {
             "_variant": "SimplePattern",
             "value": value,
@@ -394,7 +402,7 @@ export namespace Pattern {
             variant: _.Symbol.for("SimplePattern")
         };
     };
-    export function CompoundPattern<_embedded = _.GenericEmbedded>(value: CompoundPattern<_embedded>): Pattern<_embedded> {
+    export function CompoundPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(value: CompoundPattern<_embedded>): Pattern<_embedded> {
         return {
             "_variant": "CompoundPattern",
             "value": value,
@@ -414,7 +422,7 @@ export namespace Pattern {
 }
 
 export namespace SimplePattern {
-    export function any<_embedded = _.GenericEmbedded>(): SimplePattern<_embedded> {
+    export function any<_embedded extends _.Embeddable = _.GenericEmbedded>(): SimplePattern<_embedded> {
         return {
             "_variant": "any",
             __as_preserve__() {return fromSimplePattern(this);},
@@ -430,7 +438,7 @@ export namespace SimplePattern {
             variant: _.Symbol.for("any")
         };
     };
-    export function atom<_embedded = _.GenericEmbedded>(atomKind: AtomKind): SimplePattern<_embedded> {
+    export function atom<_embedded extends _.Embeddable = _.GenericEmbedded>(atomKind: AtomKind): SimplePattern<_embedded> {
         return {
             "_variant": "atom",
             "atomKind": atomKind,
@@ -447,7 +455,7 @@ export namespace SimplePattern {
             variant: _.Symbol.for("atom")
         };
     };
-    export function embedded<_embedded = _.GenericEmbedded>($interface: SimplePattern<_embedded>): SimplePattern<_embedded> {
+    export function embedded<_embedded extends _.Embeddable = _.GenericEmbedded>($interface: SimplePattern<_embedded>): SimplePattern<_embedded> {
         return {
             "_variant": "embedded",
             "interface": $interface,
@@ -464,7 +472,7 @@ export namespace SimplePattern {
             variant: _.Symbol.for("embedded")
         };
     };
-    export function lit<_embedded = _.GenericEmbedded>(value: _.Value<_embedded>): SimplePattern<_embedded> {
+    export function lit<_embedded extends _.Embeddable = _.GenericEmbedded>(value: _.Value<_embedded>): SimplePattern<_embedded> {
         return {
             "_variant": "lit",
             "value": value,
@@ -481,7 +489,7 @@ export namespace SimplePattern {
             variant: _.Symbol.for("lit")
         };
     };
-    export function seqof<_embedded = _.GenericEmbedded>(pattern: SimplePattern<_embedded>): SimplePattern<_embedded> {
+    export function seqof<_embedded extends _.Embeddable = _.GenericEmbedded>(pattern: SimplePattern<_embedded>): SimplePattern<_embedded> {
         return {
             "_variant": "seqof",
             "pattern": pattern,
@@ -498,7 +506,7 @@ export namespace SimplePattern {
             variant: _.Symbol.for("seqof")
         };
     };
-    export function setof<_embedded = _.GenericEmbedded>(pattern: SimplePattern<_embedded>): SimplePattern<_embedded> {
+    export function setof<_embedded extends _.Embeddable = _.GenericEmbedded>(pattern: SimplePattern<_embedded>): SimplePattern<_embedded> {
         return {
             "_variant": "setof",
             "pattern": pattern,
@@ -515,7 +523,7 @@ export namespace SimplePattern {
             variant: _.Symbol.for("setof")
         };
     };
-    export function dictof<_embedded = _.GenericEmbedded>({key, value}: {key: SimplePattern<_embedded>, value: SimplePattern<_embedded>}): SimplePattern<_embedded> {
+    export function dictof<_embedded extends _.Embeddable = _.GenericEmbedded>({key, value}: {key: SimplePattern<_embedded>, value: SimplePattern<_embedded>}): SimplePattern<_embedded> {
         return {
             "_variant": "dictof",
             "key": key,
@@ -533,7 +541,7 @@ export namespace SimplePattern {
             variant: _.Symbol.for("dictof")
         };
     };
-    export function Ref<_embedded = _.GenericEmbedded>(value: Ref): SimplePattern<_embedded> {
+    export function Ref<_embedded extends _.Embeddable = _.GenericEmbedded>(value: Ref): SimplePattern<_embedded> {
         return {
             "_variant": "Ref",
             "value": value,
@@ -553,7 +561,7 @@ export namespace SimplePattern {
 }
 
 export namespace CompoundPattern {
-    export function rec<_embedded = _.GenericEmbedded>(
+    export function rec<_embedded extends _.Embeddable = _.GenericEmbedded>(
         {label, fields}: {label: NamedPattern<_embedded>, fields: NamedPattern<_embedded>}
     ): CompoundPattern<_embedded> {
         return {
@@ -573,7 +581,7 @@ export namespace CompoundPattern {
             variant: _.Symbol.for("rec")
         };
     };
-    export function tuple<_embedded = _.GenericEmbedded>(patterns: Array<NamedPattern<_embedded>>): CompoundPattern<_embedded> {
+    export function tuple<_embedded extends _.Embeddable = _.GenericEmbedded>(patterns: Array<NamedPattern<_embedded>>): CompoundPattern<_embedded> {
         return {
             "_variant": "tuple",
             "patterns": patterns,
@@ -590,7 +598,7 @@ export namespace CompoundPattern {
             variant: _.Symbol.for("tuple")
         };
     };
-    export function tuplePrefix<_embedded = _.GenericEmbedded>(
+    export function tuplePrefix<_embedded extends _.Embeddable = _.GenericEmbedded>(
         {fixed, variable}: {fixed: Array<NamedPattern<_embedded>>, variable: NamedSimplePattern<_embedded>}
     ): CompoundPattern<_embedded> {
         return {
@@ -610,7 +618,7 @@ export namespace CompoundPattern {
             variant: _.Symbol.for("tuplePrefix")
         };
     };
-    export function dict<_embedded = _.GenericEmbedded>(entries: DictionaryEntries<_embedded>): CompoundPattern<_embedded> {
+    export function dict<_embedded extends _.Embeddable = _.GenericEmbedded>(entries: DictionaryEntries<_embedded>): CompoundPattern<_embedded> {
         return {
             "_variant": "dict",
             "entries": entries,
@@ -629,8 +637,8 @@ export namespace CompoundPattern {
     };
 }
 
-export function DictionaryEntries<_embedded = _.GenericEmbedded>(
-    value: _.EncodableDictionary<_.Value<_embedded>, NamedSimplePattern<_embedded>, _embedded>
+export function DictionaryEntries<_embedded extends _.Embeddable = _.GenericEmbedded>(
+    value: _.EncodableDictionary<_embedded, _.Value<_embedded>, NamedSimplePattern<_embedded>>
 ): DictionaryEntries<_embedded> {return value;}
 
 DictionaryEntries.schema = function () {
@@ -740,7 +748,7 @@ export namespace AtomKind {
     };
 }
 
-export function NamedAlternative<_embedded = _.GenericEmbedded>({variantLabel, pattern}: {variantLabel: string, pattern: Pattern<_embedded>}): NamedAlternative<_embedded> {
+export function NamedAlternative<_embedded extends _.Embeddable = _.GenericEmbedded>({variantLabel, pattern}: {variantLabel: string, pattern: Pattern<_embedded>}): NamedAlternative<_embedded> {
     return {
         "variantLabel": variantLabel,
         "pattern": pattern,
@@ -759,7 +767,7 @@ NamedAlternative.schema = function () {
 }
 
 export namespace NamedSimplePattern {
-    export function named<_embedded = _.GenericEmbedded>(value: Binding<_embedded>): NamedSimplePattern<_embedded> {
+    export function named<_embedded extends _.Embeddable = _.GenericEmbedded>(value: Binding<_embedded>): NamedSimplePattern<_embedded> {
         return {
             "_variant": "named",
             "value": value,
@@ -776,7 +784,7 @@ export namespace NamedSimplePattern {
             variant: _.Symbol.for("named")
         };
     };
-    export function anonymous<_embedded = _.GenericEmbedded>(value: SimplePattern<_embedded>): NamedSimplePattern<_embedded> {
+    export function anonymous<_embedded extends _.Embeddable = _.GenericEmbedded>(value: SimplePattern<_embedded>): NamedSimplePattern<_embedded> {
         return {
             "_variant": "anonymous",
             "value": value,
@@ -796,7 +804,7 @@ export namespace NamedSimplePattern {
 }
 
 export namespace NamedPattern {
-    export function named<_embedded = _.GenericEmbedded>(value: Binding<_embedded>): NamedPattern<_embedded> {
+    export function named<_embedded extends _.Embeddable = _.GenericEmbedded>(value: Binding<_embedded>): NamedPattern<_embedded> {
         return {
             "_variant": "named",
             "value": value,
@@ -813,7 +821,7 @@ export namespace NamedPattern {
             variant: _.Symbol.for("named")
         };
     };
-    export function anonymous<_embedded = _.GenericEmbedded>(value: Pattern<_embedded>): NamedPattern<_embedded> {
+    export function anonymous<_embedded extends _.Embeddable = _.GenericEmbedded>(value: Pattern<_embedded>): NamedPattern<_embedded> {
         return {
             "_variant": "anonymous",
             "value": value,
@@ -832,7 +840,7 @@ export namespace NamedPattern {
     };
 }
 
-export function Binding<_embedded = _.GenericEmbedded>({name, pattern}: {name: symbol, pattern: SimplePattern<_embedded>}): Binding<_embedded> {
+export function Binding<_embedded extends _.Embeddable = _.GenericEmbedded>({name, pattern}: {name: symbol, pattern: SimplePattern<_embedded>}): Binding<_embedded> {
     return {
         "name": name,
         "pattern": pattern,
@@ -870,13 +878,13 @@ ModulePath.schema = function () {
     };
 }
 
-export function asBundle<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Bundle<_embedded> {
+export function asBundle<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Bundle<_embedded> {
     let result = toBundle(v);
     if (result === void 0) throw new TypeError(`Invalid Bundle: ${_.stringify(v)}`);
     return result;
 }
 
-export function toBundle<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Bundle<_embedded> {
+export function toBundle<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Bundle<_embedded> {
     let result: undefined | Bundle<_embedded>;
     if (_.Record.isRecord<_.Value<_embedded>, _.Tuple<_.Value<_embedded>>, _embedded>(v)) {
         let _tmp0: ({}) | undefined;
@@ -899,27 +907,28 @@ export function toBundle<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 Bundle.__from_preserve__ = toBundle;
 
-export function fromBundle<_embedded = _.GenericEmbedded>(_v: Bundle<_embedded>): _.Value<_embedded> {return _.Record($bundle, [fromModules<_embedded>(_v["modules"])]);}
+export function fromBundle<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Bundle<_embedded>): _.Value<_embedded> {return _.Record($bundle, [fromModules<_embedded>(_v["modules"])]);}
 
-export function asModules<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Modules<_embedded> {
+export function asModules<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Modules<_embedded> {
     let result = toModules(v);
     if (result === void 0) throw new TypeError(`Invalid Modules: ${_.stringify(v)}`);
     return result;
 }
 
-export function toModules<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Modules<_embedded> {
-    let _tmp0: (_.EncodableDictionary<ModulePath, Schema<_embedded>, _embedded>) | undefined;
+export function toModules<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Modules<_embedded> {
+    let _tmp0: (_.EncodableDictionary<_embedded, ModulePath, Schema<_embedded>>) | undefined;
     let result: undefined | Modules<_embedded>;
     _tmp0 = void 0;
     if (_.Dictionary.isDictionary<_embedded>(v)) {
-        _tmp0 = new _.EncodableDictionary<ModulePath, Schema<_embedded>, _embedded>(fromModulePath, fromSchema<_embedded>);
-        for (const [_tmp1, _tmp2] of v) {
-            let _tmp3: (ModulePath) | undefined;
-            _tmp3 = toModulePath(_tmp1);
-            if (_tmp3 !== void 0) {
-                let _tmp4: (Schema<_embedded>) | undefined;
-                _tmp4 = toSchema(_tmp2);
-                if (_tmp4 !== void 0) {_tmp0.set(_tmp3, _tmp4); continue;};
+        const _tmp1 = new _.DictionaryMap(v);
+        _tmp0 = new _.EncodableDictionary<_embedded, ModulePath, Schema<_embedded>>(fromModulePath, fromSchema<_embedded>);
+        for (const [_tmp2, _tmp3] of _tmp1) {
+            let _tmp4: (ModulePath) | undefined;
+            _tmp4 = toModulePath(_tmp2);
+            if (_tmp4 !== void 0) {
+                let _tmp5: (Schema<_embedded>) | undefined;
+                _tmp5 = toSchema(_tmp3);
+                if (_tmp5 !== void 0) {_tmp0.set(_tmp4, _tmp5); continue;};
             };
             _tmp0 = void 0;
             break;
@@ -931,44 +940,45 @@ export function toModules<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 Modules.__from_preserve__ = toModules;
 
-export function fromModules<_embedded = _.GenericEmbedded>(_v: Modules<_embedded>): _.Value<_embedded> {
-    return new _.Dictionary<_embedded>(
+export function fromModules<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Modules<_embedded>): _.Value<_embedded> {
+    return _.Dictionary.from<_embedded>(
         _.Array.from(_v.entries()).map(([k, v]) => [fromModulePath<_embedded>(k), fromSchema<_embedded>(v)])
     );
 }
 
-export function asSchema<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Schema<_embedded> {
+export function asSchema<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Schema<_embedded> {
     let result = toSchema(v);
     if (result === void 0) throw new TypeError(`Invalid Schema: ${_.stringify(v)}`);
     return result;
 }
 
-export function toSchema<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Schema<_embedded> {
+export function toSchema<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Schema<_embedded> {
     let result: undefined | Schema<_embedded>;
     if (_.Record.isRecord<_.Value<_embedded>, _.Tuple<_.Value<_embedded>>, _embedded>(v)) {
         let _tmp0: ({}) | undefined;
         _tmp0 = _.is(v.label, $schema) ? {} : void 0;
         if (_tmp0 !== void 0) {
             if (_.Dictionary.isDictionary<_embedded>(v[0])) {
-                let _tmp1: (_.Value<_embedded>) | undefined;
-                if ((_tmp1 = v[0].get($version)) !== void 0) {
-                    let _tmp2: (Version) | undefined;
-                    _tmp2 = toVersion(_tmp1);
-                    if (_tmp2 !== void 0) {
-                        let _tmp3: (_.Value<_embedded>) | undefined;
-                        if ((_tmp3 = v[0].get($embeddedType)) !== void 0) {
-                            let _tmp4: (EmbeddedTypeName) | undefined;
-                            _tmp4 = toEmbeddedTypeName(_tmp3);
-                            if (_tmp4 !== void 0) {
-                                let _tmp5: (_.Value<_embedded>) | undefined;
-                                if ((_tmp5 = v[0].get($definitions)) !== void 0) {
-                                    let _tmp6: (Definitions<_embedded>) | undefined;
-                                    _tmp6 = toDefinitions(_tmp5);
-                                    if (_tmp6 !== void 0) {
+                let _tmp2: (_.Value<_embedded>) | undefined;
+                const _tmp1 = new _.DictionaryMap(v[0]);
+                if ((_tmp2 = _tmp1.get($version)) !== void 0) {
+                    let _tmp3: (Version) | undefined;
+                    _tmp3 = toVersion(_tmp2);
+                    if (_tmp3 !== void 0) {
+                        let _tmp4: (_.Value<_embedded>) | undefined;
+                        if ((_tmp4 = _tmp1.get($embeddedType)) !== void 0) {
+                            let _tmp5: (EmbeddedTypeName) | undefined;
+                            _tmp5 = toEmbeddedTypeName(_tmp4);
+                            if (_tmp5 !== void 0) {
+                                let _tmp6: (_.Value<_embedded>) | undefined;
+                                if ((_tmp6 = _tmp1.get($definitions)) !== void 0) {
+                                    let _tmp7: (Definitions<_embedded>) | undefined;
+                                    _tmp7 = toDefinitions(_tmp6);
+                                    if (_tmp7 !== void 0) {
                                         result = {
-                                            "version": _tmp2,
-                                            "embeddedType": _tmp4,
-                                            "definitions": _tmp6,
+                                            "version": _tmp3,
+                                            "embeddedType": _tmp5,
+                                            "definitions": _tmp7,
                                             __as_preserve__() {return fromSchema(this);},
                                             __preserve_on__(e) { e.push(fromSchema(this)); },
                                             __preserve_text_on__(w) { w.push(fromSchema(this)); }
@@ -987,11 +997,11 @@ export function toSchema<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 Schema.__from_preserve__ = toSchema;
 
-export function fromSchema<_embedded = _.GenericEmbedded>(_v: Schema<_embedded>): _.Value<_embedded> {
+export function fromSchema<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Schema<_embedded>): _.Value<_embedded> {
     return _.Record(
         $schema,
         [
-            new _.Dictionary<_embedded>(
+            _.Dictionary.from<_embedded>(
                 [
                     [$version, fromVersion<_embedded>(_v["version"])],
                     [$embeddedType, fromEmbeddedTypeName<_embedded>(_v["embeddedType"])],
@@ -1002,13 +1012,13 @@ export function fromSchema<_embedded = _.GenericEmbedded>(_v: Schema<_embedded>)
     );
 }
 
-export function asVersion<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Version {
+export function asVersion<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Version {
     let result = toVersion(v);
     if (result === void 0) throw new TypeError(`Invalid Version: ${_.stringify(v)}`);
     return result;
 }
 
-export function toVersion<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Version {
+export function toVersion<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Version {
     let _tmp0: ({}) | undefined;
     let result: undefined | Version;
     _tmp0 = _.is(v, $1) ? {} : void 0;
@@ -1024,15 +1034,15 @@ export function toVersion<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 Version.__from_preserve__ = toVersion;
 
-export function fromVersion<_embedded = _.GenericEmbedded>(_v: Version): _.Value<_embedded> {return $1;}
+export function fromVersion<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Version): _.Value<_embedded> {return $1;}
 
-export function asEmbeddedTypeName<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): EmbeddedTypeName {
+export function asEmbeddedTypeName<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): EmbeddedTypeName {
     let result = toEmbeddedTypeName(v);
     if (result === void 0) throw new TypeError(`Invalid EmbeddedTypeName: ${_.stringify(v)}`);
     return result;
 }
 
-export function toEmbeddedTypeName<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | EmbeddedTypeName {
+export function toEmbeddedTypeName<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | EmbeddedTypeName {
     let _tmp0: ({}) | undefined;
     let result: undefined | EmbeddedTypeName;
     _tmp0 = _.is(v, __lit6) ? {} : void 0;
@@ -1062,32 +1072,33 @@ export function toEmbeddedTypeName<_embedded = _.GenericEmbedded>(v: _.Value<_em
 
 export namespace EmbeddedTypeName {export const __from_preserve__ = toEmbeddedTypeName;}
 
-export function fromEmbeddedTypeName<_embedded = _.GenericEmbedded>(_v: EmbeddedTypeName): _.Value<_embedded> {
+export function fromEmbeddedTypeName<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: EmbeddedTypeName): _.Value<_embedded> {
     switch (_v._variant) {
         case "false": {return __lit6;};
         case "Ref": {return fromRef<_embedded>(_v.value);};
     };
 }
 
-export function asDefinitions<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Definitions<_embedded> {
+export function asDefinitions<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Definitions<_embedded> {
     let result = toDefinitions(v);
     if (result === void 0) throw new TypeError(`Invalid Definitions: ${_.stringify(v)}`);
     return result;
 }
 
-export function toDefinitions<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Definitions<_embedded> {
-    let _tmp0: (_.EncodableDictionary<symbol, Definition<_embedded>, _embedded>) | undefined;
+export function toDefinitions<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Definitions<_embedded> {
+    let _tmp0: (_.JsDictionary<Definition<_embedded>>) | undefined;
     let result: undefined | Definitions<_embedded>;
     _tmp0 = void 0;
     if (_.Dictionary.isDictionary<_embedded>(v)) {
-        _tmp0 = new _.EncodableDictionary<symbol, Definition<_embedded>, _embedded>(k => k, fromDefinition<_embedded>);
-        for (const [_tmp1, _tmp2] of v) {
-            let _tmp3: (symbol) | undefined;
-            _tmp3 = typeof _tmp1 === 'symbol' ? _tmp1 : void 0;
-            if (_tmp3 !== void 0) {
-                let _tmp4: (Definition<_embedded>) | undefined;
-                _tmp4 = toDefinition(_tmp2);
-                if (_tmp4 !== void 0) {_tmp0.set(_tmp3, _tmp4); continue;};
+        const _tmp1 = new _.DictionaryMap(v);
+        _tmp0 = {};
+        for (const [_tmp2, _tmp3] of _tmp1) {
+            let _tmp4: (symbol) | undefined;
+            _tmp4 = typeof _tmp2 === 'symbol' ? _tmp2 : void 0;
+            if (_tmp4 !== void 0) {
+                let _tmp5: (Definition<_embedded>) | undefined;
+                _tmp5 = toDefinition(_tmp3);
+                if (_tmp5 !== void 0) {_tmp0[_tmp4.description!] = _tmp5; continue;};
             };
             _tmp0 = void 0;
             break;
@@ -1099,17 +1110,19 @@ export function toDefinitions<_embedded = _.GenericEmbedded>(v: _.Value<_embedde
 
 Definitions.__from_preserve__ = toDefinitions;
 
-export function fromDefinitions<_embedded = _.GenericEmbedded>(_v: Definitions<_embedded>): _.Value<_embedded> {
-    return new _.Dictionary<_embedded>(_.Array.from(_v.entries()).map(([k, v]) => [k, fromDefinition<_embedded>(v)]));
+export function fromDefinitions<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Definitions<_embedded>): _.Value<_embedded> {
+    return _.Dictionary.from<_embedded>(
+        _.Array.from(_.JsDictionary.entries(_v)).map(([k, v]) => [k, fromDefinition<_embedded>(v)])
+    );
 }
 
-export function asDefinition<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Definition<_embedded> {
+export function asDefinition<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Definition<_embedded> {
     let result = toDefinition(v);
     if (result === void 0) throw new TypeError(`Invalid Definition: ${_.stringify(v)}`);
     return result;
 }
 
-export function toDefinition<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Definition<_embedded> {
+export function toDefinition<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Definition<_embedded> {
     let result: undefined | Definition<_embedded>;
     if (_.Record.isRecord<_.Value<_embedded>, _.Tuple<_.Value<_embedded>>, _embedded>(v)) {
         let _tmp0: ({}) | undefined;
@@ -1207,7 +1220,7 @@ export function toDefinition<_embedded = _.GenericEmbedded>(v: _.Value<_embedded
 
 export namespace Definition {export const __from_preserve__ = toDefinition;}
 
-export function fromDefinition<_embedded = _.GenericEmbedded>(_v: Definition<_embedded>): _.Value<_embedded> {
+export function fromDefinition<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Definition<_embedded>): _.Value<_embedded> {
     switch (_v._variant) {
         case "or": {
             return _.Record(
@@ -1237,13 +1250,13 @@ export function fromDefinition<_embedded = _.GenericEmbedded>(_v: Definition<_em
     };
 }
 
-export function asPattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Pattern<_embedded> {
+export function asPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Pattern<_embedded> {
     let result = toPattern(v);
     if (result === void 0) throw new TypeError(`Invalid Pattern: ${_.stringify(v)}`);
     return result;
 }
 
-export function toPattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Pattern<_embedded> {
+export function toPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Pattern<_embedded> {
     let _tmp0: (SimplePattern<_embedded>) | undefined;
     let result: undefined | Pattern<_embedded>;
     _tmp0 = toSimplePattern(v);
@@ -1274,20 +1287,20 @@ export function toPattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 export namespace Pattern {export const __from_preserve__ = toPattern;}
 
-export function fromPattern<_embedded = _.GenericEmbedded>(_v: Pattern<_embedded>): _.Value<_embedded> {
+export function fromPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Pattern<_embedded>): _.Value<_embedded> {
     switch (_v._variant) {
         case "SimplePattern": {return fromSimplePattern<_embedded>(_v.value);};
         case "CompoundPattern": {return fromCompoundPattern<_embedded>(_v.value);};
     };
 }
 
-export function asSimplePattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): SimplePattern<_embedded> {
+export function asSimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): SimplePattern<_embedded> {
     let result = toSimplePattern(v);
     if (result === void 0) throw new TypeError(`Invalid SimplePattern: ${_.stringify(v)}`);
     return result;
 }
 
-export function toSimplePattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | SimplePattern<_embedded> {
+export function toSimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | SimplePattern<_embedded> {
     let _tmp0: ({}) | undefined;
     let result: undefined | SimplePattern<_embedded>;
     _tmp0 = _.is(v, $any) ? {} : void 0;
@@ -1436,7 +1449,7 @@ export function toSimplePattern<_embedded = _.GenericEmbedded>(v: _.Value<_embed
 
 export namespace SimplePattern {export const __from_preserve__ = toSimplePattern;}
 
-export function fromSimplePattern<_embedded = _.GenericEmbedded>(_v: SimplePattern<_embedded>): _.Value<_embedded> {
+export function fromSimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: SimplePattern<_embedded>): _.Value<_embedded> {
     switch (_v._variant) {
         case "any": {return $any;};
         case "atom": {return _.Record($atom, [fromAtomKind<_embedded>(_v["atomKind"])]);};
@@ -1457,13 +1470,13 @@ export function fromSimplePattern<_embedded = _.GenericEmbedded>(_v: SimplePatte
     };
 }
 
-export function asCompoundPattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): CompoundPattern<_embedded> {
+export function asCompoundPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): CompoundPattern<_embedded> {
     let result = toCompoundPattern(v);
     if (result === void 0) throw new TypeError(`Invalid CompoundPattern: ${_.stringify(v)}`);
     return result;
 }
 
-export function toCompoundPattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | CompoundPattern<_embedded> {
+export function toCompoundPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | CompoundPattern<_embedded> {
     let result: undefined | CompoundPattern<_embedded>;
     if (_.Record.isRecord<_.Value<_embedded>, _.Tuple<_.Value<_embedded>>, _embedded>(v)) {
         let _tmp0: ({}) | undefined;
@@ -1574,7 +1587,7 @@ export function toCompoundPattern<_embedded = _.GenericEmbedded>(v: _.Value<_emb
 
 export namespace CompoundPattern {export const __from_preserve__ = toCompoundPattern;}
 
-export function fromCompoundPattern<_embedded = _.GenericEmbedded>(_v: CompoundPattern<_embedded>): _.Value<_embedded> {
+export function fromCompoundPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: CompoundPattern<_embedded>): _.Value<_embedded> {
     switch (_v._variant) {
         case "rec": {
             return _.Record(
@@ -1601,25 +1614,26 @@ export function fromCompoundPattern<_embedded = _.GenericEmbedded>(_v: CompoundP
     };
 }
 
-export function asDictionaryEntries<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): DictionaryEntries<_embedded> {
+export function asDictionaryEntries<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): DictionaryEntries<_embedded> {
     let result = toDictionaryEntries(v);
     if (result === void 0) throw new TypeError(`Invalid DictionaryEntries: ${_.stringify(v)}`);
     return result;
 }
 
-export function toDictionaryEntries<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | DictionaryEntries<_embedded> {
-    let _tmp0: (_.EncodableDictionary<_.Value<_embedded>, NamedSimplePattern<_embedded>, _embedded>) | undefined;
+export function toDictionaryEntries<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | DictionaryEntries<_embedded> {
+    let _tmp0: (_.EncodableDictionary<_embedded, _.Value<_embedded>, NamedSimplePattern<_embedded>>) | undefined;
     let result: undefined | DictionaryEntries<_embedded>;
     _tmp0 = void 0;
     if (_.Dictionary.isDictionary<_embedded>(v)) {
-        _tmp0 = new _.EncodableDictionary<_.Value<_embedded>, NamedSimplePattern<_embedded>, _embedded>(k => k, fromNamedSimplePattern<_embedded>);
-        for (const [_tmp1, _tmp2] of v) {
-            let _tmp3: (_.Value<_embedded>) | undefined;
-            _tmp3 = _tmp1;
-            if (_tmp3 !== void 0) {
-                let _tmp4: (NamedSimplePattern<_embedded>) | undefined;
-                _tmp4 = toNamedSimplePattern(_tmp2);
-                if (_tmp4 !== void 0) {_tmp0.set(_tmp3, _tmp4); continue;};
+        const _tmp1 = new _.DictionaryMap(v);
+        _tmp0 = new _.EncodableDictionary<_embedded, _.Value<_embedded>, NamedSimplePattern<_embedded>>(k => k, fromNamedSimplePattern<_embedded>);
+        for (const [_tmp2, _tmp3] of _tmp1) {
+            let _tmp4: (_.Value<_embedded>) | undefined;
+            _tmp4 = _tmp2;
+            if (_tmp4 !== void 0) {
+                let _tmp5: (NamedSimplePattern<_embedded>) | undefined;
+                _tmp5 = toNamedSimplePattern(_tmp3);
+                if (_tmp5 !== void 0) {_tmp0.set(_tmp4, _tmp5); continue;};
             };
             _tmp0 = void 0;
             break;
@@ -1631,19 +1645,19 @@ export function toDictionaryEntries<_embedded = _.GenericEmbedded>(v: _.Value<_e
 
 DictionaryEntries.__from_preserve__ = toDictionaryEntries;
 
-export function fromDictionaryEntries<_embedded = _.GenericEmbedded>(_v: DictionaryEntries<_embedded>): _.Value<_embedded> {
-    return new _.Dictionary<_embedded>(
+export function fromDictionaryEntries<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: DictionaryEntries<_embedded>): _.Value<_embedded> {
+    return _.Dictionary.from<_embedded>(
         _.Array.from(_v.entries()).map(([k, v]) => [k, fromNamedSimplePattern<_embedded>(v)])
     );
 }
 
-export function asAtomKind<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): AtomKind {
+export function asAtomKind<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): AtomKind {
     let result = toAtomKind(v);
     if (result === void 0) throw new TypeError(`Invalid AtomKind: ${_.stringify(v)}`);
     return result;
 }
 
-export function toAtomKind<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | AtomKind {
+export function toAtomKind<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | AtomKind {
     let _tmp0: ({}) | undefined;
     let result: undefined | AtomKind;
     _tmp0 = _.is(v, $Boolean) ? {} : void 0;
@@ -1720,7 +1734,7 @@ export function toAtomKind<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>)
 
 export namespace AtomKind {export const __from_preserve__ = toAtomKind;}
 
-export function fromAtomKind<_embedded = _.GenericEmbedded>(_v: AtomKind): _.Value<_embedded> {
+export function fromAtomKind<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: AtomKind): _.Value<_embedded> {
     switch (_v._variant) {
         case "Boolean": {return $Boolean;};
         case "Double": {return $Double;};
@@ -1731,15 +1745,15 @@ export function fromAtomKind<_embedded = _.GenericEmbedded>(_v: AtomKind): _.Val
     };
 }
 
-export function asNamedAlternative<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): NamedAlternative<_embedded> {
+export function asNamedAlternative<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): NamedAlternative<_embedded> {
     let result = toNamedAlternative(v);
     if (result === void 0) throw new TypeError(`Invalid NamedAlternative: ${_.stringify(v)}`);
     return result;
 }
 
-export function toNamedAlternative<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | NamedAlternative<_embedded> {
+export function toNamedAlternative<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | NamedAlternative<_embedded> {
     let result: undefined | NamedAlternative<_embedded>;
-    if (_.isSequence(v) && v.length === 2) {
+    if (_.isSequence(v) && v.length >= 2) {
         let _tmp0: (string) | undefined;
         _tmp0 = typeof v[0] === 'string' ? v[0] : void 0;
         if (_tmp0 !== void 0) {
@@ -1761,15 +1775,15 @@ export function toNamedAlternative<_embedded = _.GenericEmbedded>(v: _.Value<_em
 
 NamedAlternative.__from_preserve__ = toNamedAlternative;
 
-export function fromNamedAlternative<_embedded = _.GenericEmbedded>(_v: NamedAlternative<_embedded>): _.Value<_embedded> {return [_v["variantLabel"], fromPattern<_embedded>(_v["pattern"])];}
+export function fromNamedAlternative<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: NamedAlternative<_embedded>): _.Value<_embedded> {return [_v["variantLabel"], fromPattern<_embedded>(_v["pattern"])];}
 
-export function asNamedSimplePattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): NamedSimplePattern<_embedded> {
+export function asNamedSimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): NamedSimplePattern<_embedded> {
     let result = toNamedSimplePattern(v);
     if (result === void 0) throw new TypeError(`Invalid NamedSimplePattern: ${_.stringify(v)}`);
     return result;
 }
 
-export function toNamedSimplePattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | NamedSimplePattern<_embedded> {
+export function toNamedSimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | NamedSimplePattern<_embedded> {
     let _tmp0: (Binding<_embedded>) | undefined;
     let result: undefined | NamedSimplePattern<_embedded>;
     _tmp0 = toBinding(v);
@@ -1800,20 +1814,20 @@ export function toNamedSimplePattern<_embedded = _.GenericEmbedded>(v: _.Value<_
 
 export namespace NamedSimplePattern {export const __from_preserve__ = toNamedSimplePattern;}
 
-export function fromNamedSimplePattern<_embedded = _.GenericEmbedded>(_v: NamedSimplePattern<_embedded>): _.Value<_embedded> {
+export function fromNamedSimplePattern<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: NamedSimplePattern<_embedded>): _.Value<_embedded> {
     switch (_v._variant) {
         case "named": {return fromBinding<_embedded>(_v.value);};
         case "anonymous": {return fromSimplePattern<_embedded>(_v.value);};
     };
 }
 
-export function asNamedPattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): NamedPattern<_embedded> {
+export function asNamedPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): NamedPattern<_embedded> {
     let result = toNamedPattern(v);
     if (result === void 0) throw new TypeError(`Invalid NamedPattern: ${_.stringify(v)}`);
     return result;
 }
 
-export function toNamedPattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | NamedPattern<_embedded> {
+export function toNamedPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | NamedPattern<_embedded> {
     let _tmp0: (Binding<_embedded>) | undefined;
     let result: undefined | NamedPattern<_embedded>;
     _tmp0 = toBinding(v);
@@ -1844,20 +1858,20 @@ export function toNamedPattern<_embedded = _.GenericEmbedded>(v: _.Value<_embedd
 
 export namespace NamedPattern {export const __from_preserve__ = toNamedPattern;}
 
-export function fromNamedPattern<_embedded = _.GenericEmbedded>(_v: NamedPattern<_embedded>): _.Value<_embedded> {
+export function fromNamedPattern<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: NamedPattern<_embedded>): _.Value<_embedded> {
     switch (_v._variant) {
         case "named": {return fromBinding<_embedded>(_v.value);};
         case "anonymous": {return fromPattern<_embedded>(_v.value);};
     };
 }
 
-export function asBinding<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Binding<_embedded> {
+export function asBinding<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Binding<_embedded> {
     let result = toBinding(v);
     if (result === void 0) throw new TypeError(`Invalid Binding: ${_.stringify(v)}`);
     return result;
 }
 
-export function toBinding<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Binding<_embedded> {
+export function toBinding<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Binding<_embedded> {
     let result: undefined | Binding<_embedded>;
     if (_.Record.isRecord<_.Value<_embedded>, _.Tuple<_.Value<_embedded>>, _embedded>(v)) {
         let _tmp0: ({}) | undefined;
@@ -1885,17 +1899,17 @@ export function toBinding<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>):
 
 Binding.__from_preserve__ = toBinding;
 
-export function fromBinding<_embedded = _.GenericEmbedded>(_v: Binding<_embedded>): _.Value<_embedded> {
+export function fromBinding<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Binding<_embedded>): _.Value<_embedded> {
     return _.Record($named, [_v["name"], fromSimplePattern<_embedded>(_v["pattern"])]);
 }
 
-export function asRef<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): Ref {
+export function asRef<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): Ref {
     let result = toRef(v);
     if (result === void 0) throw new TypeError(`Invalid Ref: ${_.stringify(v)}`);
     return result;
 }
 
-export function toRef<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Ref {
+export function toRef<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | Ref {
     let result: undefined | Ref;
     if (_.Record.isRecord<_.Value<_embedded>, _.Tuple<_.Value<_embedded>>, _embedded>(v)) {
         let _tmp0: ({}) | undefined;
@@ -1923,15 +1937,15 @@ export function toRef<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): und
 
 Ref.__from_preserve__ = toRef;
 
-export function fromRef<_embedded = _.GenericEmbedded>(_v: Ref): _.Value<_embedded> {return _.Record($ref, [fromModulePath<_embedded>(_v["module"]), _v["name"]]);}
+export function fromRef<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: Ref): _.Value<_embedded> {return _.Record($ref, [fromModulePath<_embedded>(_v["module"]), _v["name"]]);}
 
-export function asModulePath<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): ModulePath {
+export function asModulePath<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): ModulePath {
     let result = toModulePath(v);
     if (result === void 0) throw new TypeError(`Invalid ModulePath: ${_.stringify(v)}`);
     return result;
 }
 
-export function toModulePath<_embedded = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | ModulePath {
+export function toModulePath<_embedded extends _.Embeddable = _.GenericEmbedded>(v: _.Value<_embedded>): undefined | ModulePath {
     let _tmp0: (Array<symbol>) | undefined;
     let result: undefined | ModulePath;
     _tmp0 = void 0;
@@ -1951,5 +1965,5 @@ export function toModulePath<_embedded = _.GenericEmbedded>(v: _.Value<_embedded
 
 ModulePath.__from_preserve__ = toModulePath;
 
-export function fromModulePath<_embedded = _.GenericEmbedded>(_v: ModulePath): _.Value<_embedded> {return _v.map(v => v);}
+export function fromModulePath<_embedded extends _.Embeddable = _.GenericEmbedded>(_v: ModulePath): _.Value<_embedded> {return _v.map(v => v);}
 

implementations/javascript/packages/schema/src/host.ts

@@ -1,11 +1,11 @@
-import { compare } from '@preserves/core';
+import { compare, Embeddable } from '@preserves/core';
 
 import * as M from './meta';
 import * as H from './gen/host';
 
 export * from './gen/host';
 
-export function definitionType<V>(p: M.Definition<V>): H.Definition {
+export function definitionType<V extends Embeddable>(p: M.Definition<V>): H.Definition {
     switch (p._variant) {
         case 'or': return H.Definition.union([p.pattern0, p.pattern1, ... p.patternN].map(p =>
             H.Variant({ label: Symbol.for(p.variantLabel), type: patternType(p.pattern) })));
@@ -16,7 +16,7 @@ export function definitionType<V>(p: M.Definition<V>): H.Definition {
     }
 }
 
-export function patternType<V>(p: M.Pattern<V>): H.Simple {
+export function patternType<V extends Embeddable>(p: M.Pattern<V>): H.Simple {
     switch (p._variant) {
         case 'SimplePattern':
             return H.Simple.Field(fieldType(p.value));
@@ -25,7 +25,7 @@ export function patternType<V>(p: M.Pattern<V>): H.Simple {
     }
 }
 
-export function fieldType<V>(p: M.SimplePattern<V>): H.Field {
+export function fieldType<V extends Embeddable>(p: M.SimplePattern<V>): H.Field {
     switch (p._variant) {
         case 'any': return H.Field.any();
         case 'atom': return H.Field.AtomKind(p.atomKind);
@@ -38,19 +38,19 @@ export function fieldType<V>(p: M.SimplePattern<V>): H.Field {
     }
 }
 
-export function productType<V>(ps: M.NamedPattern<V>[]): H.Simple {
+export function productType<V extends Embeddable>(ps: M.NamedPattern<V>[]): H.Simple {
     const gathered: H.NamedField[] = [];
     ps.forEach(p => gather(p, gathered));
     if (gathered.length === 0) return H.Simple.Field(H.Field.unit());
     return H.Simple.Record(H.Record(gathered));
 }
 
-function promote<V>(p: M.NamedSimplePattern<V>): M.NamedPattern<V> {
+function promote<V extends Embeddable>(p: M.NamedSimplePattern<V>): M.NamedPattern<V> {
     if (p._variant === 'named') return p;
     return M.NamedPattern.anonymous(M.Pattern.SimplePattern(p.value));
 }
 
-function gather<V>(p: M.NamedPattern<V>, into: H.NamedField[]) {
+function gather<V extends Embeddable>(p: M.NamedPattern<V>, into: H.NamedField[]) {
     switch (p._variant) {
         case 'named': {
             const t = fieldType(p.value.pattern);

implementations/javascript/packages/schema/src/interpreter.ts

@@ -1,35 +1,38 @@
-import { EncodableDictionary, KeyedDictionary, Dictionary, Value, is, Record, Float, Bytes, isEmbedded, isSequence, Set, Atom, Embedded, merge as plainMerge, Preservable, PreserveWritable, _iterMap, stringify, fromJS } from '@preserves/core';
+import { EncodableDictionary, KeyedDictionary, Dictionary, Value, is, Record, Float, Bytes, isEmbedded, isSequence, Set, Atom, merge as plainMerge, Preservable, PreserveWritable, _iterMap, stringify, fromJS, Embeddable, DictionaryMap, JsDictionary } from '@preserves/core';
 import { SchemaDefinition } from './reflection';
 import * as M from './meta';
 import * as H from './host';
 
 export const UNIT: true = true;
 
-export type Parsed<V> = Atom | V | Parsed<V>[] | DictOf<V> | Bindings<V>;
-export type TopParsed<V> = Atom | V | Parsed<V>[] | DictOf<V> | TopBindings<V>;
+export type Parsed<V extends Embeddable> = Atom | V | Parsed<V>[] | DictOf<V> | Bindings<V>;
+export type TopParsed<V extends Embeddable> = Atom | V | Parsed<V>[] | DictOf<V> | TopBindings<V>;
 
-export type Top<V> = Preservable<V> & PreserveWritable<V> & { __as_preserve__(): Value<V> };
+export type Top<V extends Embeddable> =
+    & Preservable<V>
+    & PreserveWritable<V>
+    & { __as_preserve__(): Value<V> };
 
-export type DictOf<V> = EncodableDictionary<Parsed<V>, Parsed<V>, V>;
+export type DictOf<V extends Embeddable> = EncodableDictionary<V, Parsed<V>, Parsed<V>>;
 
 export type BindingName = string;
-export type Bindings<V> = { [key: BindingName]: Parsed<V> };
-export type TopBindings<V> = Bindings<V> & Top<V>;
+export type Bindings<V extends Embeddable> = { [key: BindingName]: Parsed<V> };
+export type TopBindings<V extends Embeddable> = Bindings<V> & Top<V>;
 
-export type SingleConstructor<V> = ((input: any) => Parsed<V>) & { schema(): SchemaDefinition };
-export type MultipleConstructors<V> = { [key: string]: SingleConstructor<V> };
-export type DefinitionConstructors<V> = SingleConstructor<V> | MultipleConstructors<V>;
+export type SingleConstructor<V extends Embeddable> = ((input: any) => Parsed<V>) & { schema(): SchemaDefinition };
+export type MultipleConstructors<V extends Embeddable> = { [key: string]: SingleConstructor<V> };
+export type DefinitionConstructors<V extends Embeddable> = SingleConstructor<V> | MultipleConstructors<V>;
 
 export namespace Bindings {
-    export function empty<V>(): Bindings<V> {
+    export function empty<V extends Embeddable>(): Bindings<V> {
         return {};
     }
-    export function single<V>(k: BindingName, v: Parsed<V>): Bindings<V> {
+    export function single<V extends Embeddable>(k: BindingName, v: Parsed<V>): Bindings<V> {
         const bs = empty<V>();
         bs[k] = v;
         return bs;
     }
-    export function merge<V>(... vs: Bindings<V>[]): Bindings<V> {
+    export function merge<V extends Embeddable>(... vs: Bindings<V>[]): Bindings<V> {
         const acc = empty<V>();
         for (const v of vs) {
             Object.entries(v).forEach(([kw, vw]) => acc[kw] = vw);
@@ -38,29 +41,29 @@ export namespace Bindings {
     }
 }
 
-export type DynField<V> =
+export type DynField<V extends Embeddable> =
     | { type: 'simple', value: Parsed<V> }
     | { type: 'compound', values: Bindings<V> }
 ;
 export namespace DynField {
-    export function unwrap<V>(f: DynField<V>): Parsed<V> {
+    export function unwrap<V extends Embeddable>(f: DynField<V>): Parsed<V> {
         if (f.type === 'simple') return f.value;
         return f.values;
     }
-    export function unwrap_compound<V>(f: DynField<V>): Bindings<V> {
+    export function unwrap_compound<V extends Embeddable>(f: DynField<V>): Bindings<V> {
         if (f.type === 'simple') throw new Error("Cannot unwrap DynField.simple to compound fields");
         return f.values;
     }
-    export function simple<V>(value: Parsed<V>): DynField<V> {
+    export function simple<V extends Embeddable>(value: Parsed<V>): DynField<V> {
         return { type: 'simple', value };
     }
-    export function maybeSimple<V>(value: Parsed<V> | null): DynField<V> {
+    export function maybeSimple<V extends Embeddable>(value: Parsed<V> | null): DynField<V> {
         return value === null ? compound(Bindings.empty()) : simple(value);
     }
-    export function compound<V>(values: Bindings<V>): DynField<V> {
+    export function compound<V extends Embeddable>(values: Bindings<V>): DynField<V> {
         return { type: 'compound', values };
     }
-    export function promote<V>(f: DynField<V>, key?: symbol): Bindings<V> {
+    export function promote<V extends Embeddable>(f: DynField<V>, key?: symbol): Bindings<V> {
         if (f.type === 'compound') return f.values;
         return key ? Bindings.single(M.jsId(key.description!), f.value) : Bindings.empty();
     }
@@ -71,11 +74,27 @@ function optmap<A,B>(a: A | undefined, f: (a: A) => B): B | undefined {
     return f(a);
 }
 
-export type Unparseable<V> = TopParsed<V>;
-export type Unparser<V> = (v: Parsed<V>) => Value<V>;
-export type UnparserCompound<V> = (v: Bindings<V>) => Value<V>;
+export type Unparseable<V extends Embeddable> = TopParsed<V>;
+export type Unparser<V extends Embeddable> = (v: Parsed<V>) => Value<V>;
+export type UnparserCompound<V extends Embeddable> = (v: Bindings<V>) => Value<V>;
 
-export class SchemaInterpreter<V> {
+function attachSchema<V extends Embeddable>(
+    schema: M.Schema<V>,
+    name: symbol,
+    f: (input: any) => Parsed<V>,
+    variant?: symbol,
+): SingleConstructor<V> {
+    const g = f as SingleConstructor<V>;
+    g.schema = () => ({
+        schema: fromJS(schema),
+        imports: {}, // TODO
+        definitionName: name,
+        variant,
+    });
+    return g;
+}
+
+export class SchemaInterpreter<V extends Embeddable> {
     activeModule: M.ModulePath = [];
     unparserCache: { [key: string]: [Unparser<V>] } = {};
 
@@ -116,7 +135,7 @@ export class SchemaInterpreter<V> {
     ): R {
         const { resolved, schema } = this._findModule(modulePath);
         return this._withModule(resolved, () => {
-            const definition = schema.definitions.get(name);
+            const definition = JsDictionary.get(schema.definitions, name);
             if (definition === void 0) {
                 throw new Error(`No such preserves-schema definition: ${[... modulePath, name].map(s => s.description!).join('.')}`);
             }
@@ -132,65 +151,62 @@ export class SchemaInterpreter<V> {
         return result;
     }
 
+    buildConstructor(
+        modulePath: M.ModulePath,
+        name: symbol,
+        schema: M.Schema<V>,
+        ty: H.Simple,
+        variant?: symbol,
+    ): SingleConstructor<V> {
+        const flatName = M.formatModulePath([
+            ... modulePath, name, ... (variant === void 0 ? [] : [variant])]);
+        const mkBase = (variant === void 0)
+            ? () => ({})
+            : () => ({ _variant: variant.description! });
+        switch (ty._variant) {
+            case 'Field': {
+                const tmp =
+                    ty.value._variant === 'unit'
+                    ? { [flatName]: () => this.makeTop(modulePath, name, mkBase()) }
+                    : (variant === void 0
+                        ? { [flatName]: (value: any) => value }
+                        : { [flatName]: (value: any) => this.makeTop(
+                            modulePath, name, { ... mkBase(), value }) });
+                return attachSchema(schema, name, tmp[flatName], variant);
+            }
+            case 'Record': {
+                const rec = ty.value;
+                if (rec.fields.length > 1) {
+                    const tmp = { [flatName]: (fields: Bindings<V>) =>
+                        this.makeTop(modulePath, name, { ... mkBase(), ... fields }) };
+                    return attachSchema(schema, name, tmp[flatName], variant);
+                } else {
+                    const tmp = { [flatName]: (field: Parsed<V>) =>
+                        this.makeTop(modulePath, name, {
+                            ... mkBase(),
+                            [M.jsId(rec.fields[0].name.description!)]: field,
+                        }) };
+                    return attachSchema(schema, name, tmp[flatName], variant);
+                }
+            }
+        }
+    }
+
     definitionConstructor(
         modulePath: M.ModulePath,
         name: symbol,
     ): DefinitionConstructors<V> {
         return this._lookup(modulePath, name, (definition, schema): DefinitionConstructors<V> => {
-            function attachSchema(
-                f: (input: any) => Parsed<V>,
-                variant?: symbol,
-            ): SingleConstructor<V> {
-                const g = f as SingleConstructor<V>;
-                g.schema = () => ({
-                    schema: fromJS(schema),
-                    imports: {}, // TODO
-                    definitionName: name,
-                    variant,
-                });
-                return g;
-            }
             const ty = H.definitionType(definition);
             if (ty._variant === 'union') {
                 const multiple: MultipleConstructors<V> = {};
                 ty.variants.forEach(v => {
-                    const _variant = v.label.description!;
-                    switch (v.type._variant) {
-                        case 'Field':
-                            multiple[_variant] = attachSchema(
-                                (value: any) => this.makeTop(modulePath, name, { _variant, value }),
-                                v.label);
-                            break;
-                        case 'Record':
-                            multiple[_variant] = attachSchema(
-                                (fields: object) => this.makeTop(modulePath, name, { _variant, ... fields }),
-                                v.label);
-                            break;
-                    }
+                    multiple[M.jsId(v.label.description!)] = this.buildConstructor(
+                        modulePath, name, schema, v.type, v.label);
                 });
                 return multiple;
             } else {
-                const flatName = M.formatModulePath([... modulePath, name]);
-                switch (ty.value._variant) {
-                    case 'Field': {
-                        const tmp = { [flatName]: (value: any) => value };
-                        return attachSchema(tmp[flatName]);
-                    }
-                    case 'Record': {
-                        const rec = ty.value.value;
-                        if (rec.fields.length > 1) {
-                            const tmp = { [flatName]: (fields: Bindings<V>) =>
-                                this.makeTop(modulePath, name, fields) };
-                            return attachSchema(tmp[flatName]);
-                        } else {
-                            const tmp = { [flatName]: (field: Parsed<V>) =>
-                                this.makeTop(modulePath, name, {
-                                    [M.jsId(rec.fields[0].name.description!)]: field,
-                                }) };
-                            return attachSchema(tmp[flatName]);
-                        }
-                    }
-                }
+                return this.buildConstructor(modulePath, name, schema, ty.value);
             }
         });
     }
@@ -219,7 +235,11 @@ export class SchemaInterpreter<V> {
                 if (ty._variant === 'union' || ty.value._variant === 'Record') {
                     return this.makeTop(modulePath, name, result0 as Bindings<V>);
                 } else {
-                    return result0 as Exclude<Parsed<V>, Bindings<V>>;
+                    if (ty.value.value._variant === 'unit') {
+                        return this.makeTop(modulePath, name, {});
+                    } else {
+                        return result0 as Exclude<Parsed<V>, Bindings<V>>;
+                    }
                 }
             }));
     }
@@ -291,7 +311,7 @@ export class SchemaInterpreter<V> {
                 case 'ByteString': return inputIf(Bytes.isBytes(input));
                 case 'Symbol': return inputIf(typeof input === 'symbol');
             }
-            case 'embedded': return isEmbedded(input) ? input.embeddedValue : void 0;
+            case 'embedded': return isEmbedded(input) ? input : void 0;
             case 'lit': return is(input, p.value) ? null : void 0;
             case 'seqof': {
                 if (!isSequence(input)) return void 0;
@@ -315,17 +335,29 @@ export class SchemaInterpreter<V> {
             }
             case 'dictof': {
                 if (!Dictionary.isDictionary<V>(input)) return void 0;
-                const result: DictOf<V> = new EncodableDictionary(
-                    this.unparserSimplePattern(p.key),
-                    this.unparserSimplePattern(p.value));
-                for (const [k, v] of input) {
-                    const kw = this.parseSimplePattern(p.key, k);
-                    if (kw === void 0) return void 0;
-                    const vw = this.parseSimplePattern(p.value, v);
-                    if (vw === void 0) return void 0;
-                    result.set(kw === null ? UNIT : kw, vw === null ? UNIT : vw);
+                if (M.isSymbolPattern(p.key)) {
+                    const result: Bindings<V> = {};
+                    for (const [k, v] of Dictionary.asMap<V>(input)) {
+                        const kw = this.parseSimplePattern(p.key, k);
+                        if (kw === void 0 || typeof kw !== 'symbol') return void 0;
+                        const vw = this.parseSimplePattern(p.value, v);
+                        if (vw === void 0) return void 0;
+                        result[kw.description!] = vw === null ? UNIT : vw;
+                    }
+                    return result;
+                } else {
+                    const result: DictOf<V> = new EncodableDictionary(
+                        this.unparserSimplePattern(p.key),
+                        this.unparserSimplePattern(p.value));
+                    for (const [k, v] of Dictionary.asMap<V>(input)) {
+                        const kw = this.parseSimplePattern(p.key, k);
+                        if (kw === void 0) return void 0;
+                        const vw = this.parseSimplePattern(p.value, v);
+                        if (vw === void 0) return void 0;
+                        result.set(kw === null ? UNIT : kw, vw === null ? UNIT : vw);
+                    }
+                    return result;
                 }
-                return result;
             }
             case 'Ref': return this.tryParse(p.value.module, p.value.name, input);
         }
@@ -340,7 +372,7 @@ export class SchemaInterpreter<V> {
                                            fsw => Bindings.merge(lw, fsw)));
             case 'tuple': {
                 if (!isSequence(input)) return void 0;
-                if (input.length !== p.patterns.length) return void 0;
+                if (input.length < p.patterns.length) return void 0;
                 let results: Bindings<V>[] = [];
                 for (let i = 0; i < p.patterns.length; i++) {
                     const w = this.parseNamedPattern(p.patterns[i], input[i]);
@@ -365,10 +397,11 @@ export class SchemaInterpreter<V> {
                 });
             }
             case 'dict': {
-                if (!Dictionary.isDictionary<V>(input)) return void 0;
+                const inputMap = Dictionary.asMap<V>(input);
+                if (!inputMap) return void 0;
                 const results: Bindings<V>[] = [];
                 for (const [key, vp] of p.entries) {
-                    const v = input.get(key);
+                    const v = inputMap.get(key);
                     if (v === void 0) return void 0;
                     const vw = this.parseNamedSimplePattern(vp, v);
                     if (vw === void 0) return void 0;
@@ -467,7 +500,7 @@ export class SchemaInterpreter<V> {
         switch (p._variant) {
             case 'any': return v => v as Value<V>; // ?!
             case 'atom': return v => v as Atom;
-            case 'embedded': return v => new Embedded(v as V);
+            case 'embedded': return v => v as V;
             case 'lit': return _v => p.value;
             case 'seqof': {
                 const up = this.unparserSimplePattern(p.pattern);
@@ -480,8 +513,17 @@ export class SchemaInterpreter<V> {
             case 'dictof': {
                 const kp = this.unparserSimplePattern(p.key);
                 const vp = this.unparserSimplePattern(p.value);
-                return vs => new Dictionary<V>(_iterMap(
-                    (vs as DictOf<V>).entries(), ([k, v]) => [kp(k), vp(v)]));
+                return vs => {
+                    const d = new DictionaryMap<V>();
+                    for (const [k, v] of
+                         (Map.isMap(vs)
+                             ? vs.entries()
+                             : JsDictionary.entries(vs as Bindings<V>)))
+                    {
+                        d.set(kp(k), vp(v));
+                    }
+                    return M.isSymbolPattern(p.key) ? d.asJsDictionary() : d.asKeyedDictionary();
+                };
             }
             case 'Ref': {
                 const up = this._unparser(p.value.module, p.value.name);
@@ -510,11 +552,11 @@ export class SchemaInterpreter<V> {
                 const ups: [Value<V>, Unparser<V>][] = Array.from(p.entries.entries()).map(
                     ([key, vp]) => [key, this.unparserNamedSimplePattern(vp)]);
                 return bs => {
-                    const result = new Dictionary<V>();
+                    const result = new DictionaryMap<V>();
                     for (const [key, up] of ups) {
                         result.set(key, up(bs));
                     }
-                    return result;
+                    return result.simplifiedValue();
                 };
             }
         }
@@ -531,4 +573,32 @@ export class SchemaInterpreter<V> {
                 return this.unparserSimplePattern(p.value);
         }
     }
+
+    moduleFor(modulePath: M.ModulePath): { [key: string]: any } | undefined {
+        const schema = this.env.get(modulePath);
+        if (schema === void 0) return void 0;
+        const mod: { [key: string]: any } = {};
+        JsDictionary.forEach(schema.definitions, (_d, n) => {
+            const definitionName = n.description!;
+            const definitionId = M.jsId(definitionName);
+            mod[`${definitionId}`] = this.definitionConstructor(modulePath, n);
+            mod[`from${definitionId}`] = this.unparser(modulePath, n);
+            mod[`to${definitionId}`] = (v: Value<V>) => this.tryParse(modulePath, n, v);
+            mod[`as${definitionId}`] = (v: Value<V>) => this.parse(modulePath, n, v);
+        });
+        return mod;
+    }
+
+    moduleTree(tree: { [key: string]: any } = {}): { [key: string]: any } {
+        for (const modulePath of this.env.keys()) {
+            let container = tree;
+            modulePath.slice(0, -1).forEach(n => {
+                if (!(n.description! in container)) container[n.description!] = {};
+                container = container[n.description!];
+            });
+            container[modulePath[modulePath.length - 1].description!] =
+                this.moduleFor(modulePath)!;
+        }
+        return tree;
+    }
 }

implementations/javascript/packages/schema/src/meta.ts

@@ -1,4 +1,4 @@
-import { GenericEmbedded, is, Value } from '@preserves/core';
+import { Embeddable, GenericEmbedded, is, Value } from '@preserves/core';
 import * as M from './gen/schema';
 import { isJsKeyword } from './compiler/jskw';
 
@@ -98,3 +98,8 @@ export function namelike(x: Input): string | undefined {
     if (typeof x === 'boolean') return x ? 'true' : 'false';
     return void 0;
 }
+
+export function isSymbolPattern<T extends Embeddable>(p: M.SimplePattern<T>): boolean {
+    return p._variant === 'atom'
+        && p.atomKind._variant === 'Symbol';
+}

implementations/javascript/packages/schema/src/reader.ts

@@ -1,4 +1,4 @@
-import { Reader, Annotated, Dictionary, is, peel, preserves, Record, strip, Tuple, Position, position, stringify, isCompound, EncodableDictionary, annotate, annotations, isEmbedded, GenericEmbedded, genericEmbeddedTypeDecode } from '@preserves/core';
+import { Reader, Annotated, Dictionary, is, peel, preserves, Record, strip, Tuple, Position, position, stringify, isCompound, EncodableDictionary, annotate, annotations, isEmbedded, GenericEmbedded, genericEmbeddedTypeDecode, JsDictionary, KeyedDictionary } from '@preserves/core';
 import { Input, Pattern, Schema, Definition, CompoundPattern, SimplePattern } from './meta';
 import * as M from './meta';
 import { SchemaSyntaxError } from './error';
@@ -70,7 +70,7 @@ export function parseSchema(toplevelTokens: Array<Input>, options: SchemaReaderO
 {
     let version: M.Version | undefined = void 0;
     let embeddedType: M.EmbeddedTypeName = M.EmbeddedTypeName.$false();
-    let definitions: M.Definitions = new EncodableDictionary(k => k, M.fromDefinition);
+    let definitions: M.Definitions = {};
 
     function process(toplevelTokens: Array<Input>): void {
         const toplevelClauses = splitBy(peel(toplevelTokens) as Array<Input>, M.DOT);
@@ -82,10 +82,10 @@ export function parseSchema(toplevelTokens: Array<Input>, options: SchemaReaderO
                 if (!M.isValidToken(name.description!)) {
                     throw new SchemaSyntaxError(preserves`Invalid definition name: ${name}`, pos);
                 }
-                if (definitions.has(name)) {
+                if (JsDictionary.has(definitions, name)) {
                     throw new SchemaSyntaxError(preserves`Duplicate definition: ${clause}`, pos);
                 }
-                definitions.set(name, parseDefinition(name, pos, clause.slice(2)));
+                JsDictionary.set(definitions, name, parseDefinition(name, pos, clause.slice(2)));
             } else if (clause.length === 2 && is(clause[0], M.$version)) {
                 version = M.asVersion(peel(clause[1]));
             } else if (clause.length === 2 && is(clause[0], M.$embeddedType)) {
@@ -232,7 +232,7 @@ function parsePattern(name: symbol, body0: Array<Input>): Pattern {
                 case 'symbol': return ks(M.SimplePattern.atom(M.AtomKind.Symbol()));
                 default: {
                     if (str[0] === '=') {
-                        return ks(M.SimplePattern.lit(Symbol.for(str.slice(1))));
+                        return ks(M.SimplePattern.lit<GenericEmbedded>(Symbol.for(str.slice(1))));
                     } else if (M.isValidQid(str)) {
                         return ks(M.SimplePattern.Ref(parseRef(str, pos)));
                     } else {
@@ -260,20 +260,20 @@ function parsePattern(name: symbol, body0: Array<Input>): Pattern {
             if (item.size !== 1) complain();
             const [vp] = item.values();
             return ks(M.SimplePattern.setof(walkSimple(vp)));
-        } else if (Dictionary.isDictionary<M.InputEmbedded, Input>(item)
-            && item.size === 2
-            && item.has(M.DOTDOTDOT))
-        {
-            const v = item.clone();
-            v.delete(M.DOTDOTDOT);
-            const [[kp, vp]] = v.entries();
-            return ks(M.SimplePattern.dictof({ key: walkSimple(kp), value: walkSimple(vp) }));
-        } else if (isCompound(item)) {
-            return kf();
-        } else if (isEmbedded(item)) {
-            return ks(M.SimplePattern.embedded(walkSimple(item.embeddedValue.generic)));
         } else {
-            return ks(M.SimplePattern.lit(strip(item)));
+            const itemMap = Dictionary.asMap<M.InputEmbedded, Input>(item);
+            if (itemMap && itemMap.size === 2 && itemMap.has(M.DOTDOTDOT)) {
+                const v = itemMap.clone();
+                v.delete(M.DOTDOTDOT);
+                const [[kp, vp]] = v.entries();
+                return ks(M.SimplePattern.dictof({ key: walkSimple(kp), value: walkSimple(vp) }));
+            } else if (isCompound(item)) {
+                return kf();
+            } else if (isEmbedded(item)) {
+                return ks(M.SimplePattern.embedded(walkSimple(item.generic)));
+            } else {
+                return ks(M.SimplePattern.lit(strip(item)));
+            }
         }
     }
 
@@ -312,19 +312,20 @@ function parsePattern(name: symbol, body0: Array<Input>): Pattern {
             });
         } else if (Array.isArray(item)) {
             return M.CompoundPattern.tuple(item.map(maybeNamed));
-        } else if (Dictionary.isDictionary<M.InputEmbedded, Input>(item) && !item.has(M.DOTDOTDOT)) {
-            return M.CompoundPattern.dict(
-                M.DictionaryEntries(item.mapEntries<M.NamedSimplePattern, Input, M.InputEmbedded>(
-                    ([k, vp]) => [
-                        strip(k),
-                        _maybeNamed(
-                            M.NamedSimplePattern.named,
-                            M.NamedSimplePattern.anonymous,
-                            walkSimple,
-                            strip(k))(vp)
-                    ])));
         } else {
-            complain();
+            const itemMap = Dictionary.asMap<M.InputEmbedded, Input>(item);
+            if (itemMap && !itemMap.has(M.DOTDOTDOT)) {
+                const entries = new KeyedDictionary<M.InputEmbedded, Input, M.NamedSimplePattern>();
+                itemMap.forEach((vp, k) => entries.set(
+                    strip(k),
+                    _maybeNamed(M.NamedSimplePattern.named,
+                                M.NamedSimplePattern.anonymous,
+                                walkSimple,
+                                strip(k))(vp)));
+                return M.CompoundPattern.dict(M.DictionaryEntries(entries));
+            } else {
+                complain();
+            }
         }
     }
 

implementations/javascript/packages/schema/test/compiler.test.ts

@@ -0,0 +1,29 @@
+import {  } from '@preserves/core';
+import { compile, Meta as M, readSchema } from '../src/index';
+import './test-utils';
+import { js as format } from 'js-beautify';
+
+function compileSingleSchema(source: string): string {
+    return format(compile([], [Symbol.for('test')], readSchema(`version 1 . ${source}`), {}));
+}
+
+describe('compiler', () => {
+    it('basics', () => {
+        expect(compileSingleSchema(`X = int .`)).toContain(`\nexport type X = number;\n`);
+    });
+
+    it('symbol-keyed dictionary', () => {
+        const s = compileSingleSchema(`D = { symbol:any ...:... } .`);
+        expect(s).toMatch(/^export type D.*= _.JsDictionary < _.Value < _embedded >> ;$/m);
+    });
+
+    it('string-keyed dictionary', () => {
+        const s = compileSingleSchema(`D = { string:any ...:... } .`);
+        expect(s).toMatch(/^export type D.*= _.EncodableDictionary < _embedded, string, _.Value < _embedded >> ;$/m);
+    });
+
+    it('any-keyed dictionary', () => {
+        const s = compileSingleSchema(`D = { any:any ...:... } .`);
+        expect(s).toMatch(/^export type D.*= _.EncodableDictionary < _embedded, _.Value < _embedded > , _.Value < _embedded >> ;$/m);
+    });
+});

implementations/javascript/packages/schema/test/interpreter.test.ts

@@ -0,0 +1,111 @@
+import { GenericEmbedded, stringify, fromJS, parse, EncodableDictionary, KeyedDictionary } from '@preserves/core';
+import { SchemaInterpreter, readSchema } from '../src/index';
+import './test-utils';
+
+describe('interpreter', () => {
+    const I = new SchemaInterpreter<GenericEmbedded>();
+
+    const X_schema = readSchema(`
+version 1 .
+A = <foo> .
+B = <bar @v int> .
+C = <zot @v int @w int> .
+N = int .
+
+U = <class @a int @b int> / <true @c int @d int> .
+V = <public @n int> / <private @n int> .
+W = <const> / <let> .
+
+D1 = { symbol:A ...:... } .
+D2 = { any:A ...:... } .
+D3 = { string:A ...:... } .
+`);
+    const X = Symbol.for('X');
+    I.env.set([X], X_schema);
+
+    const E = I.moduleTree();
+
+    it('basically works', () => {
+        const a = E.X.A();
+        const b = E.X.B(22);
+        const c = E.X.C({v: 33, w: 44});
+        const n = E.X.N(22);
+        expect(stringify(a)).toBe('<foo>');
+        expect(stringify(b)).toBe('<bar 22>');
+        expect(stringify(c)).toBe('<zot 33 44>');
+        expect(stringify(n)).toBe('22');
+        expect(parse('<foo>')).is(fromJS(a));
+        expect(parse('<bar 22>')).is(fromJS(b));
+        expect(parse('<zot 33 44>')).is(fromJS(c));
+        expect(parse('22')).is(fromJS(n));
+        expect(stringify(E.X.asA(fromJS(a)))).toBe('<foo>');
+        expect(stringify(E.X.asB(fromJS(b)))).toBe('<bar 22>');
+        expect(stringify(E.X.asC(fromJS(c)))).toBe('<zot 33 44>');
+        expect(stringify(E.X.asN(fromJS(n)))).toBe('22');
+    });
+
+    it('escapes JS keywords', () => {
+        expect(Object.keys(E.X.U)).toEqual(['$class', '$true']);
+        expect(Object.keys(E.X.V)).toEqual(['$public', '$private']);
+        expect(Object.keys(E.X.W)).toEqual(['$const', '$let']);
+    });
+
+    const STANDARD_METHODS = ['__as_preserve__', '__preserve_on__', '__preserve_text_on__'];
+
+    it('accepts correct arguments to n-ary variant ctors', () => {
+        expect(stringify(E.X.U.$class({ a: 123, b: 234 }))).toBe('<class 123 234>');
+        expect(stringify(E.X.U.$true({ c: 123, d: 234 }))).toBe('<true 123 234>');
+        expect(Object.keys(E.X.U.$class({ a: 123, b: 234 }))).toEqual([
+            '_variant', 'a', 'b', ... STANDARD_METHODS]);
+    });
+
+    it('accepts correct arguments to unary variant ctors', () => {
+        expect(stringify(E.X.V.$public(123))).toBe('<public 123>');
+        expect(stringify(E.X.V.$private(123))).toBe('<private 123>');
+        expect(Object.keys(E.X.V.$public(123))).toEqual([
+            '_variant', 'n', ... STANDARD_METHODS]);
+    });
+
+    it('accepts correct arguments to nullary variant ctors', () => {
+        expect(stringify(E.X.W.$const())).toBe('<const>');
+        expect(stringify(E.X.W.$let())).toBe('<let>');
+        expect(Object.keys(E.X.W.$const())).toEqual([
+            '_variant', ... STANDARD_METHODS]);
+    });
+
+    it('produces JsDictionary for symbol-keyed dicts', () => {
+        const v = E.X.asD1(parse('{ a: <foo>, b: <foo>}'));
+        expect(Object.keys(v)).toEqual(['a', 'b']);
+        expect(stringify(E.X.fromA(v.a))).toBe('<foo>');
+        expect(stringify(E.X.fromA(v.b))).toBe('<foo>');
+    });
+
+    it('produces EncodableDictionary for any-keyed dicts', () => {
+        const d2 = E.X.asD2(parse('{ a: <foo>, b: <foo>}'));
+        expect(d2 instanceof EncodableDictionary).toBe(true);
+        expect(Array.from(d2.keys())).toEqual([Symbol.for('a'), Symbol.for('b')]);
+        expect(fromJS(d2.get(Symbol.for('a')))).is(fromJS(E.X.A()));
+    });
+
+    it('accepts either kind of dictionary for symbol-keyed dicts', () => {
+        const v = { a: E.X.A(), b: E.X.A() };
+        expect(stringify(v)).toBe('{a: <foo> b: <foo>}');
+        expect(E.X.fromD1(v)).is(parse('{a: <foo> b: <foo>}'));
+        expect(E.X.fromD1(E.X.D1(v))).is(parse('{a: <foo> b: <foo>}'));
+        expect(E.X.fromD1(E.X.D1(new KeyedDictionary([
+            [parse('a'), parse('<foo>')],
+            [parse('b'), parse('<foo>')],
+        ])))).is(parse('{a: <foo> b: <foo>}'));
+    });
+
+    it('accepts either kind of dictionary for any-keyed dicts', () => {
+        const v = { a: E.X.A(), b: E.X.A() };
+        expect(stringify(v)).toBe('{a: <foo> b: <foo>}');
+        expect(E.X.fromD2(v)).is(parse('{a: <foo> b: <foo>}'));
+        expect(E.X.fromD2(E.X.D2(v))).is(parse('{a: <foo> b: <foo>}'));
+        expect(E.X.fromD2(E.X.D2(new KeyedDictionary([
+            [parse('a'), parse('<foo>')],
+            [parse('b'), parse('<foo>')],
+        ])))).is(parse('{a: <foo> b: <foo>}'));
+    });
+});

implementations/javascript/packages/schema/test/reader.test.ts

@@ -1,3 +1,4 @@
+import { JsDictionary } from '@preserves/core';
 import { readSchema, Meta } from '../src/index';
 
 describe('reader schema', () => {
@@ -14,12 +15,12 @@ describe('reader schema', () => {
             '__preserve_on__',
             '__preserve_text_on__',
         ]);
-        expect(s.definitions.size).toBe(0);
+        expect(JsDictionary.size(s.definitions)).toBe(0);
         expect(s.embeddedType._variant).toBe('false');
     });
     it('understands patterns under embed', () => {
         const s = readSchema('version 1 . X = #:0 .');
-        const def: Meta.Definition = s.definitions.get(Symbol.for('X'))!;
+        const def: Meta.Definition = JsDictionary.get(s.definitions, Symbol.for('X'))!;
         if (def._variant !== 'Pattern') fail('bad definition 1');
         if (def.value._variant !== 'SimplePattern') fail ('bad definition 2');
         if (def.value.value._variant !== 'embedded') fail('bad definition 3');

implementations/javascript/packages/schema/test/test-utils.ts

@@ -1,9 +1,9 @@
-import { Value, is, preserves } from '@preserves/core';
+import { Value, is, preserves, Embeddable } from '@preserves/core';
 
 declare global {
     namespace jest {
         interface Matchers<R> {
-            is<T>(expected: Value<T>): R;
+            is<T extends Embeddable>(expected: Value<T>): R;
             toThrowFilter(f: (e: Error) => boolean): R;
         }
     }

implementations/javascript/watchall

@@ -21,6 +21,5 @@ open "cd packages/schema; yarn run compile:watch"
 open "cd packages/schema; yarn run rollup:watch"
 open "cd packages/schema; yarn run test:watch"
 open "cd packages/schema-cli; yarn run compile:watch"
-open "cd packages/schema-cli; yarn run rollup:watch"
 
 tmux select-layout even-vertical

implementations/javascript/yarn.lock

@@ -308,6 +308,18 @@
   resolved "https://registry.yarnpkg.com/@hutson/parse-repository-url/-/parse-repository-url-3.0.2.tgz#98c23c950a3d9b6c8f0daed06da6c3af06981340"
   integrity sha512-H9XAx3hc0BQHY6l+IFSWHDySypcXsvsuLhgYLUGywmJ5pswRVQJUHpOsobnLYp2ZUaUlKiKDrgWWhosOwAEM8Q==
 
+"@isaacs/cliui@^8.0.2":
+  version "8.0.2"
+  resolved "https://registry.yarnpkg.com/@isaacs/cliui/-/cliui-8.0.2.tgz#b37667b7bc181c168782259bab42474fbf52b550"
+  integrity sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==
+  dependencies:
+    string-width "^5.1.2"
+    string-width-cjs "npm:string-width@^4.2.0"
+    strip-ansi "^7.0.1"
+    strip-ansi-cjs "npm:strip-ansi@^6.0.1"
+    wrap-ansi "^8.1.0"
+    wrap-ansi-cjs "npm:wrap-ansi@^7.0.0"
+
 "@istanbuljs/load-nyc-config@^1.0.0":
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz#fd3db1d59ecf7cf121e80650bb86712f9b55eced"
@@ -1417,6 +1429,16 @@
   dependencies:
     "@octokit/openapi-types" "^12.11.0"
 
+"@one-ini/wasm@0.1.1":
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/@one-ini/wasm/-/wasm-0.1.1.tgz#6013659736c9dbfccc96e8a9c2b3de317df39323"
+  integrity sha512-XuySG1E38YScSJoMlqovLru4KTUNSjgVTIjyh7qMX6aNN5HY5Ct5LhRJdxO79JtTzKfzV/bnWpz+zquYrISsvw==
+
+"@pkgjs/parseargs@^0.11.0":
+  version "0.11.0"
+  resolved "https://registry.yarnpkg.com/@pkgjs/parseargs/-/parseargs-0.11.0.tgz#a77ea742fab25775145434eb1d2328cf5013ac33"
+  integrity sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==
+
 "@rollup/plugin-terser@^0.4":
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/@rollup/plugin-terser/-/plugin-terser-0.4.0.tgz#4c76249ad337f3eb04ab409332f23717af2c1fbf"
@@ -1540,6 +1562,11 @@
     jest-matcher-utils "^27.0.0"
     pretty-format "^27.0.0"
 
+"@types/js-beautify@1.14":
+  version "1.14.3"
+  resolved "https://registry.yarnpkg.com/@types/js-beautify/-/js-beautify-1.14.3.tgz#6ced76f79935e37e0d613110dea369881d93c1ff"
+  integrity sha512-FMbQHz+qd9DoGvgLHxeqqVPaNRffpIu5ZjozwV8hf9JAGpIOzuAf4wGbRSo8LNITHqGjmmVjaMggTT5P4v4IHg==
+
 "@types/minimatch@*":
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-5.1.2.tgz#07508b45797cb81ec3f273011b054cd0755eddca"
@@ -1627,6 +1654,11 @@ abbrev@1:
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
   integrity sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==
 
+abbrev@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-2.0.0.tgz#cf59829b8b4f03f89dda2771cb7f3653828c89bf"
+  integrity sha512-6/mh1E2u2YgEsCHdY0Yx5oW+61gZU+1vXaoiHHrpKeuRNNgFvS+/jrwHiQhB5apAf5oB7UB7E19ol2R2LKH8hQ==
+
 acorn-globals@^6.0.0:
   version "6.0.0"
   resolved "https://registry.yarnpkg.com/acorn-globals/-/acorn-globals-6.0.0.tgz#46cdd39f0f8ff08a876619b55f5ac8a6dc770b45"
@@ -1716,6 +1748,11 @@ ansi-regex@^5.0.1:
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-5.0.1.tgz#082cb2c89c9fe8659a311a53bd6a4dc5301db304"
   integrity sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==
 
+ansi-regex@^6.0.1:
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-6.0.1.tgz#3183e38fae9a65d7cb5e53945cd5897d0260a06a"
+  integrity sha512-n5M855fKb2SsfMIiFFoVrABHJC8QtHwVx+mHWP3QcEqBHYienj5dHSgjbxtC0WEZXYt4wcD6zrQElDPhFuZgfA==
+
 ansi-styles@^3.2.1:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
@@ -1735,6 +1772,11 @@ ansi-styles@^5.0.0:
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-5.2.0.tgz#07449690ad45777d1924ac2abb2fc8895dba836b"
   integrity sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==
 
+ansi-styles@^6.1.0:
+  version "6.2.1"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-6.2.1.tgz#0e62320cf99c21afff3b3012192546aacbfb05c5"
+  integrity sha512-bN798gFfQX+viw3R7yrGWRqnrN2oRkEkUjjl4JNn4E8GxxbjtG3FbrEIIY3l8/hrwUwIeCZvi4QuOTP4MErVug==
+
 anymatch@^3.0.3, anymatch@~3.1.2:
   version "3.1.3"
   resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-3.1.3.tgz#790c58b19ba1720a84205b57c618d5ad8524973e"
@@ -1942,6 +1984,13 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
+brace-expansion@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-2.0.1.tgz#1edc459e0f0c548486ecf9fc99f2221364b9a0ae"
+  integrity sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==
+  dependencies:
+    balanced-match "^1.0.0"
+
 braces@^3.0.2, braces@~3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/braces/-/braces-3.0.2.tgz#3454e1a462ee8d599e236df336cd9ea4f8afe107"
@@ -2232,6 +2281,11 @@ combined-stream@^1.0.6, combined-stream@^1.0.8, combined-stream@~1.0.6:
   dependencies:
     delayed-stream "~1.0.0"
 
+commander@^10.0.0:
+  version "10.0.1"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-10.0.1.tgz#881ee46b4f77d1c1dccc5823433aa39b022cbe06"
+  integrity sha512-y4Mg2tXshplEbSGzx7amzPwKKOCGuoSRP/CjEdwwk0FOGlUbq6lKuoyDZTNZkmxHdJtp54hdfY/JUrdL7Xfdug==
+
 commander@^2.20.0:
   version "2.20.3"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
@@ -2265,7 +2319,7 @@ concat-stream@^2.0.0:
     readable-stream "^3.0.2"
     typedarray "^0.0.6"
 
-config-chain@^1.1.12:
+config-chain@^1.1.12, config-chain@^1.1.13:
   version "1.1.13"
   resolved "https://registry.yarnpkg.com/config-chain/-/config-chain-1.1.13.tgz#fad0795aa6a6cdaff9ed1b68e9dff94372c232f4"
   integrity sha512-qj+f8APARXHrM0hraqXYb2/bOVSV4PvJQlNZ/DVj0QrmNM2q2euizkeuVckQ57J+W0mRH6Hvi+k50M4Jul2VRQ==
@@ -2391,7 +2445,7 @@ create-require@^1.1.0:
   resolved "https://registry.yarnpkg.com/create-require/-/create-require-1.1.1.tgz#c1d7e8f1e5f6cfc9ff65f9cd352d37348756c333"
   integrity sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==
 
-cross-spawn@^7.0.3:
+cross-spawn@^7.0.0, cross-spawn@^7.0.3:
   version "7.0.3"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
   integrity sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==
@@ -2601,6 +2655,11 @@ dynamic-dedupe@^0.3.0:
   dependencies:
     xtend "^4.0.0"
 
+eastasianwidth@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/eastasianwidth/-/eastasianwidth-0.2.0.tgz#696ce2ec0aa0e6ea93a397ffcf24aa7840c827cb"
+  integrity sha512-I88TYZWc9XiYHRQ4/3c5rjjfgkjhLyW2luGIheGERbNQ6OY7yTybanSpDXZa8y7VUP9YmDcYa+eyq4ca7iLqWA==
+
 ecc-jsbn@~0.1.1:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz#3a83a904e54353287874c564b7549386849a98c9"
@@ -2609,6 +2668,16 @@ ecc-jsbn@~0.1.1:
     jsbn "~0.1.0"
     safer-buffer "^2.1.0"
 
+editorconfig@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/editorconfig/-/editorconfig-1.0.4.tgz#040c9a8e9a6c5288388b87c2db07028aa89f53a3"
+  integrity sha512-L9Qe08KWTlqYMVvMcTIvMAdl1cDUubzRNYL+WfA4bLDMHe4nemKkpmYzkznE1FwLKu0EEmy6obgQKzMJrg4x9Q==
+  dependencies:
+    "@one-ini/wasm" "0.1.1"
+    commander "^10.0.0"
+    minimatch "9.0.1"
+    semver "^7.5.3"
+
 electron-to-chromium@^1.4.284:
   version "1.4.286"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.4.286.tgz#0e039de59135f44ab9a8ec9025e53a9135eba11f"
@@ -2624,6 +2693,11 @@ emoji-regex@^8.0.0:
   resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-8.0.0.tgz#e818fd69ce5ccfcb404594f842963bf53164cc37"
   integrity sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==
 
+emoji-regex@^9.2.2:
+  version "9.2.2"
+  resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-9.2.2.tgz#840c8803b0d8047f4ff0cf963176b32d4ef3ed72"
+  integrity sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==
+
 encoding@^0.1.12:
   version "0.1.13"
   resolved "https://registry.yarnpkg.com/encoding/-/encoding-0.1.13.tgz#56574afdd791f54a8e9b2785c0582a2d26210fa9"
@@ -2897,6 +2971,14 @@ for-each@^0.3.3:
   dependencies:
     is-callable "^1.1.3"
 
+foreground-child@^3.1.0:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/foreground-child/-/foreground-child-3.1.1.tgz#1d173e776d75d2772fed08efe4a0de1ea1b12d0d"
+  integrity sha512-TMKDUnIte6bfb5nWv7V/caI169OHgvwjb7V4WkeUvbQQdjr5rWKqHFiKWb/fcOwB+CzBT+qbWjvj+DVwRskpIg==
+  dependencies:
+    cross-spawn "^7.0.0"
+    signal-exit "^4.0.1"
+
 forever-agent@~0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/forever-agent/-/forever-agent-0.6.1.tgz#fbc71f0c41adeb37f96c577ad1ed42d8fdacca91"
@@ -3103,6 +3185,17 @@ glob-parent@^5.1.1, glob-parent@^5.1.2, glob-parent@~5.1.2:
   dependencies:
     is-glob "^4.0.1"
 
+glob@^10.3.3:
+  version "10.3.10"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-10.3.10.tgz#0351ebb809fd187fe421ab96af83d3a70715df4b"
+  integrity sha512-fa46+tv1Ak0UPK1TOy/pZrIybNNt4HCv7SDzwyfiOZkvZLEbjsZkJBPtDHVshZjbecAoAGSC20MjLDG/qr679g==
+  dependencies:
+    foreground-child "^3.1.0"
+    jackspeak "^2.3.5"
+    minimatch "^9.0.1"
+    minipass "^5.0.0 || ^6.0.2 || ^7.0.0"
+    path-scurry "^1.10.1"
+
 glob@^7.1, glob@^7.1.1, glob@^7.1.2, glob@^7.1.3, glob@^7.1.4, glob@^7.1.6:
   version "7.2.3"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.2.3.tgz#b8df0fb802bbfa8e89bd1d938b4e16578ed44f2b"
@@ -3698,6 +3791,15 @@ istanbul-reports@^3.1.3:
     html-escaper "^2.0.0"
     istanbul-lib-report "^3.0.0"
 
+jackspeak@^2.3.5:
+  version "2.3.6"
+  resolved "https://registry.yarnpkg.com/jackspeak/-/jackspeak-2.3.6.tgz#647ecc472238aee4b06ac0e461acc21a8c505ca8"
+  integrity sha512-N3yCS/NegsOBokc8GAdM8UcmfsKiSS8cipheD/nivzr700H+nsMOxJjQnvwOcRYVuFkdH0wGUvW2WbXGmrZGbQ==
+  dependencies:
+    "@isaacs/cliui" "^8.0.2"
+  optionalDependencies:
+    "@pkgjs/parseargs" "^0.11.0"
+
 jest-changed-files@^27.5.1:
   version "27.5.1"
   resolved "https://registry.yarnpkg.com/jest-changed-files/-/jest-changed-files-27.5.1.tgz#a348aed00ec9bf671cc58a66fcbe7c3dfd6a68f5"
@@ -4103,6 +4205,22 @@ jest@^27.4:
     import-local "^3.0.2"
     jest-cli "^27.5.1"
 
+js-beautify@1.15:
+  version "1.15.1"
+  resolved "https://registry.yarnpkg.com/js-beautify/-/js-beautify-1.15.1.tgz#4695afb508c324e1084ee0b952a102023fc65b64"
+  integrity sha512-ESjNzSlt/sWE8sciZH8kBF8BPlwXPwhR6pWKAw8bw4Bwj+iZcnKW6ONWUutJ7eObuBZQpiIb8S7OYspWrKt7rA==
+  dependencies:
+    config-chain "^1.1.13"
+    editorconfig "^1.0.4"
+    glob "^10.3.3"
+    js-cookie "^3.0.5"
+    nopt "^7.2.0"
+
+js-cookie@^3.0.5:
+  version "3.0.5"
+  resolved "https://registry.yarnpkg.com/js-cookie/-/js-cookie-3.0.5.tgz#0b7e2fd0c01552c58ba86e0841f94dc2557dcdbc"
+  integrity sha512-cEiJEAEoIbWfCZYKWhVwFuvPX1gETRYPw6LlaTKoxD3s2AkXzkCjnp6h0V77ozyqj0jakteJ4YqDJT830+lVGw==
+
 js-tokens@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
@@ -4370,6 +4488,11 @@ lru-cache@^6.0.0:
   dependencies:
     yallist "^4.0.0"
 
+"lru-cache@^9.1.1 || ^10.0.0":
+  version "10.2.0"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-10.2.0.tgz#0bd445ca57363465900f4d1f9bd8db343a4d95c3"
+  integrity sha512-2bIM8x+VAf6JT4bKAljS1qUWgMsqZRPGJS6FSahIMPVvctcNhyVp7AJu7quxOW9jwkryBReKZY5tY5JYv2n/7Q==
+
 make-dir@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-2.1.0.tgz#5f0310e18b8be898cc07009295a30ae41e91e6f5"
@@ -4507,6 +4630,13 @@ min-indent@^1.0.0:
   resolved "https://registry.yarnpkg.com/min-indent/-/min-indent-1.0.1.tgz#a63f681673b30571fbe8bc25686ae746eefa9869"
   integrity sha512-I9jwMn07Sy/IwOj3zVkVik2JTvgpaykDZEigL6Rx6N9LbMywwUSMtxET+7lVoDLLd3O3IXwJwvuuns8UB/HeAg==
 
+minimatch@9.0.1:
+  version "9.0.1"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-9.0.1.tgz#8a555f541cf976c622daf078bb28f29fb927c253"
+  integrity sha512-0jWhJpD/MdhPXwPuiRkCbfYfSKp2qnn2eOc279qI7f+osl/l+prKSrvhg157zSYvx/1nmgn2NqdT6k2Z7zSH9w==
+  dependencies:
+    brace-expansion "^2.0.1"
+
 minimatch@^3.0, minimatch@^3.0.4, minimatch@^3.1.1:
   version "3.1.2"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.1.2.tgz#19cd194bfd3e428f049a70817c038d89ab4be35b"
@@ -4514,6 +4644,13 @@ minimatch@^3.0, minimatch@^3.0.4, minimatch@^3.1.1:
   dependencies:
     brace-expansion "^1.1.7"
 
+minimatch@^9.0.1:
+  version "9.0.3"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-9.0.3.tgz#a6e00c3de44c3a542bfaae70abfc22420a6da825"
+  integrity sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==
+  dependencies:
+    brace-expansion "^2.0.1"
+
 minimist-options@4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/minimist-options/-/minimist-options-4.1.0.tgz#c0655713c53a8a2ebd77ffa247d342c40f010619"
@@ -4595,6 +4732,11 @@ minipass@^4.0.0:
   resolved "https://registry.yarnpkg.com/minipass/-/minipass-4.0.1.tgz#2b9408c6e81bb8b338d600fb3685e375a370a057"
   integrity sha512-V9esFpNbK0arbN3fm2sxDKqMYgIp7XtVdE4Esj+PE4Qaaxdg1wIw48ITQIOn1sc8xXSmUviVL3cyjMqPlrVkiA==
 
+"minipass@^5.0.0 || ^6.0.2 || ^7.0.0":
+  version "7.0.4"
+  resolved "https://registry.yarnpkg.com/minipass/-/minipass-7.0.4.tgz#dbce03740f50a4786ba994c1fb908844d27b038c"
+  integrity sha512-jYofLM5Dam9279rdkWzqHozUo4ybjdZmCsDHePy5V/PbBcVMiSZR97gmAy45aqi8CK1lG2ECd356FU86avfwUQ==
+
 minizlib@^1.3.3:
   version "1.3.3"
   resolved "https://registry.yarnpkg.com/minizlib/-/minizlib-1.3.3.tgz#2290de96818a34c29551c8a8d301216bd65a861d"
@@ -4742,6 +4884,13 @@ nopt@^5.0.0:
   dependencies:
     abbrev "1"
 
+nopt@^7.2.0:
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/nopt/-/nopt-7.2.0.tgz#067378c68116f602f552876194fd11f1292503d7"
+  integrity sha512-CVDtwCdhYIvnAzFoJ6NJ6dX3oga9/HyciQDnG1vQDjSLMeKLJ4A93ZqYKDrgYSr1FBY5/hMYC+2VCi24pgpkGA==
+  dependencies:
+    abbrev "^2.0.0"
+
 normalize-package-data@^2.0.0, normalize-package-data@^2.3.2, normalize-package-data@^2.5.0:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-2.5.0.tgz#e66db1838b200c1dfc233225d12cb36520e234a8"
@@ -5158,6 +5307,14 @@ path-parse@^1.0.7:
   resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.7.tgz#fbc114b60ca42b30d9daf5858e4bd68bbedb6735"
   integrity sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==
 
+path-scurry@^1.10.1:
+  version "1.10.1"
+  resolved "https://registry.yarnpkg.com/path-scurry/-/path-scurry-1.10.1.tgz#9ba6bf5aa8500fe9fd67df4f0d9483b2b0bfc698"
+  integrity sha512-MkhCqzzBEpPvxxQ71Md0b1Kk51W01lrYvlMzSUaIzNsODdd7mqhiimSZlr+VegAz5Z6Vzt9Xg2ttE//XBhH3EQ==
+  dependencies:
+    lru-cache "^9.1.1 || ^10.0.0"
+    minipass "^5.0.0 || ^6.0.2 || ^7.0.0"
+
 path-type@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-3.0.0.tgz#cef31dc8e0a1a3bb0d105c0cd97cf3bf47f4e36f"
@@ -5667,6 +5824,13 @@ semver@^6.0.0, semver@^6.3.0:
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
   integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
 
+semver@^7.5.3:
+  version "7.6.0"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-7.6.0.tgz#1a46a4db4bffcccd97b743b5005c8325f23d4e2d"
+  integrity sha512-EnwXhrlwXMk9gKu5/flx5sv/an57AkRplG3hTK68W7FRDN+k+OWBj65M7719OkA82XLBxrcX0KSHj+X5COhOVg==
+  dependencies:
+    lru-cache "^6.0.0"
+
 serialize-javascript@^6.0.0:
   version "6.0.1"
   resolved "https://registry.yarnpkg.com/serialize-javascript/-/serialize-javascript-6.0.1.tgz#b206efb27c3da0b0ab6b52f48d170b7996458e5c"
@@ -5712,6 +5876,11 @@ signal-exit@^3.0.0, signal-exit@^3.0.2, signal-exit@^3.0.3:
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.7.tgz#a9a1767f8af84155114eaabd73f99273c8f59ad9"
   integrity sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==
 
+signal-exit@^4.0.1:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-4.1.0.tgz#952188c1cbd546070e2dd20d0f41c0ae0530cb04"
+  integrity sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==
+
 sisteransi@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/sisteransi/-/sisteransi-1.0.5.tgz#134d681297756437cc05ca01370d3a7a571075ed"
@@ -5887,6 +6056,15 @@ string-length@^4.0.1:
     char-regex "^1.0.2"
     strip-ansi "^6.0.0"
 
+"string-width-cjs@npm:string-width@^4.2.0":
+  version "4.2.3"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-4.2.3.tgz#269c7117d27b05ad2e536830a8ec895ef9c6d010"
+  integrity sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==
+  dependencies:
+    emoji-regex "^8.0.0"
+    is-fullwidth-code-point "^3.0.0"
+    strip-ansi "^6.0.1"
+
 string-width@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/string-width/-/string-width-1.0.2.tgz#118bdf5b8cdc51a2a7e70d211e07e2b0b9b107d3"
@@ -5905,6 +6083,15 @@ string-width@^1.0.1:
     is-fullwidth-code-point "^3.0.0"
     strip-ansi "^6.0.1"
 
+string-width@^5.0.1, string-width@^5.1.2:
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-5.1.2.tgz#14f8daec6d81e7221d2a357e668cab73bdbca794"
+  integrity sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==
+  dependencies:
+    eastasianwidth "^0.2.0"
+    emoji-regex "^9.2.2"
+    strip-ansi "^7.0.1"
+
 string.prototype.trimend@^1.0.6:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/string.prototype.trimend/-/string.prototype.trimend-1.0.6.tgz#c4a27fa026d979d79c04f17397f250a462944533"
@@ -5937,6 +6124,13 @@ string_decoder@~1.1.1:
   dependencies:
     safe-buffer "~5.1.0"
 
+"strip-ansi-cjs@npm:strip-ansi@^6.0.1":
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-6.0.1.tgz#9e26c63d30f53443e9489495b2105d37b67a85d9"
+  integrity sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==
+  dependencies:
+    ansi-regex "^5.0.1"
+
 strip-ansi@^3.0.0, strip-ansi@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-3.0.1.tgz#6a385fb8853d952d5ff05d0e8aaf94278dc63dcf"
@@ -5951,6 +6145,13 @@ strip-ansi@^6.0.0, strip-ansi@^6.0.1:
   dependencies:
     ansi-regex "^5.0.1"
 
+strip-ansi@^7.0.1:
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-7.1.0.tgz#d5b6568ca689d8561370b0707685d22434faff45"
+  integrity sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ==
+  dependencies:
+    ansi-regex "^6.0.1"
+
 strip-bom@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/strip-bom/-/strip-bom-3.0.0.tgz#2334c18e9c759f7bdd56fdef7e9ae3d588e68ed3"
@@ -6605,6 +6806,15 @@ wordwrap@^1.0.0:
   resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-1.0.0.tgz#27584810891456a4171c8d0226441ade90cbcaeb"
   integrity sha512-gvVzJFlPycKc5dZN4yPkP8w7Dc37BtP1yczEneOb4uq34pXZcvrtRTmWV8W+Ume+XCxKgbjM+nevkyFPMybd4Q==
 
+"wrap-ansi-cjs@npm:wrap-ansi@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-7.0.0.tgz#67e145cff510a6a6984bdf1152911d69d2eb9e43"
+  integrity sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==
+  dependencies:
+    ansi-styles "^4.0.0"
+    string-width "^4.1.0"
+    strip-ansi "^6.0.0"
+
 wrap-ansi@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-7.0.0.tgz#67e145cff510a6a6984bdf1152911d69d2eb9e43"
@@ -6614,6 +6824,15 @@ wrap-ansi@^7.0.0:
     string-width "^4.1.0"
     strip-ansi "^6.0.0"
 
+wrap-ansi@^8.1.0:
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-8.1.0.tgz#56dc22368ee570face1b49819975d9b9a5ead214"
+  integrity sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==
+  dependencies:
+    ansi-styles "^6.1.0"
+    string-width "^5.0.1"
+    strip-ansi "^7.0.1"
+
 wrappy@1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"

implementations/python/.envrc

@@ -1,6 +1,6 @@
 if ! [ -d .venv ]
 then
-    python -m venv .venv
+    python3 -m venv .venv
     . .venv/bin/activate
     pip install -e '.[dev]'
 else

implementations/python/Makefile

@@ -1,6 +1,6 @@
 # This used to just be
 # PACKAGEVERSION := "`python3 setup.py --version`"
-PACKAGEVERSION := $(shell python -c 'import tomllib; print(tomllib.load(open("pyproject.toml", "rb"))["project"]["version"])')
+PACKAGEVERSION := $(shell ./print-package-version)
 
 all: test build-docs
 

implementations/python/preserves/binary.py

@@ -217,7 +217,11 @@ class Decoder(BinaryCodec):
             if not vs: raise DecodeError('Too few elements in encoded record')
             return self.wrap(Record(vs[0], vs[1:]))
         if tag == 0xb5: return self.wrap(tuple(self.nextvalues()))
-        if tag == 0xb6: return self.wrap(frozenset(self.nextvalues()))
+        if tag == 0xb6:
+            vs = self.nextvalues()
+            s = frozenset(vs)
+            if len(s) != len(vs): raise DecodeError('Duplicate value')
+            return self.wrap(s)
         if tag == 0xb7: return self.wrap(ImmutableDict.from_kvs(self.nextvalues()))
         raise DecodeError('Invalid tag: ' + hex(tag))
 

implementations/python/preserves/path.py

@@ -59,13 +59,16 @@ The result of evaluating it on `testdata` is as follows:
 "In each test, let stripped = strip(annotatedValue),"
 "                  encodeBinary(·) produce canonical ordering and no annotations,"
 "                  looseEncodeBinary(·) produce any ordering, but with annotations,"
-"                  annotatedBinary(·) produce canonical ordering, but with annotations,"
+"                  annotatedBinary(·) produce “canonical ordering”, but with annotations,"
 "                  decodeBinary(·) include annotations,"
 "                  encodeText(·) include annotations,"
 "                  decodeText(·) include annotations,"
 "and check the following numbered expectations according to the table above:"
 "Implementations may vary in their treatment of the difference between expectations"
 "21/22 and 31/32, depending on how they wish to treat end-of-stream conditions."
+"The idea of canonical-ordering-with-annotations is to encode, say, sets with their elements"
+"in sorted order of their canonical annotationless binary encoding, but then actually"
+"*serialized* with the annotations present."
 
 ```
 

implementations/python/preserves/schema.py

@@ -505,7 +505,7 @@ class SchemaObject:
             return ()
         if p.key == TUPLE:
             if not sequenceish(v): raise SchemaDecodeFailed(cls, p, v)
-            if len(v) != len(p[0]): raise SchemaDecodeFailed(cls, p, v)
+            if len(v) < len(p[0]): raise SchemaDecodeFailed(cls, p, v)
             i = 0
             for pp in p[0]:
                 cls.parse(pp, v[i], args)

implementations/python/preserves/text.py

@@ -346,6 +346,10 @@ class Parser(TextCodec):
             c = self.nextchar()
             if c in ' \t': return self.unshift_annotation(self.comment_line(), self.next())
             if c in '\n\r': return self.unshift_annotation('', self.next())
+            if c == '!':
+                return self.unshift_annotation(
+                    Record(Symbol('interpreter'), [self.comment_line()]),
+                    self.next())
             if c == 'f': self.require_delimiter('#f'); return self.wrap(False)
             if c == 't': self.require_delimiter('#t'); return self.wrap(True)
             if c == '{': return self.wrap(self.read_set())

implementations/python/print-package-version

@@ -0,0 +1,5 @@
+#!/bin/sh
+cd "$(dirname "$0")"
+. ./.envrc
+exec python -c \
+     'import tomllib; print(tomllib.load(open("pyproject.toml", "rb"))["project"]["version"])'

implementations/python/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "preserves"
-version = "0.993.0"
+version = "0.995.1"
 description = "Data serialization format"
 readme = "README.md"
 requires-python = ">=3.6, <4"

implementations/python/tests/samples.pr

@@ -14,7 +14,7 @@
   "In each test, let stripped = strip(annotatedValue),"
   "                  encodeBinary(·) produce canonical ordering and no annotations,"
   "                  looseEncodeBinary(·) produce any ordering, but with annotations,"
-  "                  annotatedBinary(·) produce canonical ordering, but with annotations,"
+  "                  annotatedBinary(·) produce “canonical ordering”, but with annotations,"
   "                  decodeBinary(·) include annotations,"
   "                  encodeText(·) include annotations,"
   "                  decodeText(·) include annotations,"
@@ -39,6 +39,10 @@
   }>
   "Implementations may vary in their treatment of the difference between expectations"
   "21/22 and 31/32, depending on how they wish to treat end-of-stream conditions."
+
+  "The idea of canonical-ordering-with-annotations is to encode, say, sets with their elements"
+  "in sorted order of their canonical annotationless binary encoding, but then actually"
+  "*serialized* with the annotations present."
 ]>
 <TestCases {
   annotation1: <Test #x"85 B103616263 B00109" @"abc" 9>
@@ -62,6 +66,10 @@
     <Test #x"85 B100 85 B1066e6f726d616c B000" #
 # normal
 0>
+  annotation12: @"Interpreter-specification annotations"
+    <Test #"\x85\xb4\xb3\x0binterpreter\xb1\x0a/some/path\x84\xb3\x05value"
+     #!/some/path
+     value>
   bytes2: <Test #x"B20568656c6c6f" #"hello">
   bytes2a: <Test @"Internal whitespace is allowed, not including commas" #x"B2 05 68 65 6c 6c 6f" #"hello">
   bytes2b: @"Commas forbidden in internal whitespace" <ParseError "#x\"B2, 05, 68, 65, 6c, 6c, 6f\"">
@@ -88,6 +96,7 @@
   dict2: @"Missing close brace" <ParseShort "{ a: b, c: d ">
   dict2a: @"Missing close brace" <ParseShort "{">
   dict3: @"Duplicate key" <ParseError "{ a: 1, a: 2 }">
+  dict3a: @"Duplicate key" <DecodeError #x"b7 b00101 b00102 b00101 b00103 84">
   dict4: @"Unexpected close brace" <ParseError "}">
   dict5: @"Missing value" <DecodeError #x"b7 b00101 b00102 b00103 84">
   dict6: @"Comma not allowed between key and colon" <ParseError "{ a,: 1, b: 2 }">
@@ -187,6 +196,7 @@
   set2: @"Missing close brace" <ParseShort "#{ 1 2 3 ">
   set2a: @"Missing close brace" <ParseShort "#{">
   set3: @"Duplicate value" <ParseError "#{a a}">
+  set3a: @"Duplicate value" <DecodeError #x"b6 b00101 b00101 84">
   string0: <Test #x"b100" "">
   string3: <Test #x"b10568656c6c6f" "hello">
   string4: <Test #x"b1 14 616263e6b0b4e6b0b45c2f22080c0a0d0978797a" "abc\u6c34\u6C34\\/\"\b\f\n\r\txyz">
@@ -221,6 +231,14 @@
   symbol12: <Test #x"b3042d2d2d31" ---1>
   symbol13: <Test #x"b3042b312e78" +1.x>
   symbol14: <Test #x"b304f09d849e" |\uD834\uDD1E|>
+  symbol15: @"A 130-byte symbol"
+            <Test #x"b3 8201
+                     6161616161616161616161616161616161616161616161616161616161616161
+                     6161616161616161616161616161616161616161616161616161616161616161
+                     6161616161616161616161616161616161616161616161616161616161616161
+                     6161616161616161616161616161616161616161616161616161616161616161
+                     6161"
+             aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa>
   tag0: @"Unexpected end tag" <DecodeError #x"84">
   tag1: @"Invalid tag" <DecodeError #x"10">
   tag2: @"Invalid tag" <DecodeError #x"61b10110">

implementations/racket/preserves/preserves-schema/gen/schema.rkt

@@ -105,7 +105,9 @@
             'named
             (list
              (and ?name (? symbol?))
-             (app parse-SimplePattern (and ?pattern (not (== eof)))))))
+             (app parse-SimplePattern (and ?pattern (not (== eof))))
+             _
+             ...)))
       (Binding ?name ?pattern))
      (_ eof)))
   (define parse-Binding! (parse-success-or-error 'parse-Binding parse-Binding))
@@ -126,7 +128,7 @@
      ((and dest
            (record
             'bundle
-            (list (app parse-Modules (and ?modules (not (== eof)))))))
+            (list (app parse-Modules (and ?modules (not (== eof)))) _ ...)))
       (Bundle ?modules))
      (_ eof)))
   (define parse-Bundle! (parse-success-or-error 'parse-Bundle parse-Bundle))
@@ -198,28 +200,34 @@
             'rec
             (list
              (app parse-NamedPattern (and ?label (not (== eof))))
-             (app parse-NamedPattern (and ?fields (not (== eof)))))))
+             (app parse-NamedPattern (and ?fields (not (== eof))))
+             _
+             ...)))
       (CompoundPattern-rec ?label ?fields))
      ((and dest
            (record
             'tuple
             (list
-             (list
-              (app parse-NamedPattern (and ?patterns (not (== eof))))
-              ...))))
+             (list (app parse-NamedPattern (and ?patterns (not (== eof)))) ...)
+             _
+             ...)))
       (CompoundPattern-tuple ?patterns))
      ((and dest
            (record
             'tuplePrefix
             (list
              (list (app parse-NamedPattern (and ?fixed (not (== eof)))) ...)
-             (app parse-NamedSimplePattern (and ?variable (not (== eof)))))))
+             (app parse-NamedSimplePattern (and ?variable (not (== eof))))
+             _
+             ...)))
       (CompoundPattern-tuplePrefix ?fixed ?variable))
      ((and dest
            (record
             'dict
             (list
-             (app parse-DictionaryEntries (and ?entries (not (== eof)))))))
+             (app parse-DictionaryEntries (and ?entries (not (== eof))))
+             _
+             ...)))
       (CompoundPattern-dict ?entries))
      (_ eof)))
   (define parse-CompoundPattern!
@@ -283,7 +291,9 @@
               (app parse-NamedAlternative (and ?pattern1 (not (== eof))))
               (list
                (app parse-NamedAlternative (and ?patternN (not (== eof))))
-               ...)))))
+               ...))
+             _
+             ...)))
       (Definition-or ?pattern0 ?pattern1 ?patternN))
      ((and dest
            (record
@@ -294,7 +304,9 @@
               (app parse-NamedPattern (and ?pattern1 (not (== eof))))
               (list
                (app parse-NamedPattern (and ?patternN (not (== eof))))
-               ...)))))
+               ...))
+             _
+             ...)))
       (Definition-and ?pattern0 ?pattern1 ?patternN))
      ((app parse-Pattern (and dest (not (== eof)))) (Definition-Pattern dest))
      (_ eof)))
@@ -452,7 +464,9 @@
      ((and dest
            (list
             (and ?variantLabel (? string?))
-            (app parse-Pattern (and ?pattern (not (== eof))))))
+            (app parse-Pattern (and ?pattern (not (== eof))))
+            _
+            ...))
       (NamedAlternative ?variantLabel ?pattern))
      (_ eof)))
   (define parse-NamedAlternative!
@@ -569,7 +583,9 @@
             'ref
             (list
              (app parse-ModulePath (and ?module (not (== eof))))
-             (and ?name (? symbol?)))))
+             (and ?name (? symbol?))
+             _
+             ...)))
       (Ref ?module ?name))
      (_ eof)))
   (define parse-Ref! (parse-success-or-error 'parse-Ref parse-Ref))
@@ -608,7 +624,9 @@
                (app parse-EmbeddedTypeName (and ?embeddedType (not (== eof)))))
               ('version (app parse-Version (and ?version (not (== eof)))))
               (_ _)
-              ...))))
+              ...)
+             _
+             ...)))
       (Schema ?definitions ?embeddedType ?version))
      (_ eof)))
   (define parse-Schema! (parse-success-or-error 'parse-Schema parse-Schema))
@@ -718,30 +736,41 @@
      ((and dest
            (record
             'atom
-            (list (app parse-AtomKind (and ?atomKind (not (== eof)))))))
+            (list (app parse-AtomKind (and ?atomKind (not (== eof)))) _ ...)))
       (SimplePattern-atom ?atomKind))
      ((and dest
            (record
             'embedded
-            (list (app parse-SimplePattern (and ?interface (not (== eof)))))))
+            (list
+             (app parse-SimplePattern (and ?interface (not (== eof))))
+             _
+             ...)))
       (SimplePattern-embedded ?interface))
-     ((and dest (record 'lit (list ?value))) (SimplePattern-lit ?value))
+     ((and dest (record 'lit (list ?value _ ...))) (SimplePattern-lit ?value))
      ((and dest
            (record
             'seqof
-            (list (app parse-SimplePattern (and ?pattern (not (== eof)))))))
+            (list
+             (app parse-SimplePattern (and ?pattern (not (== eof))))
+             _
+             ...)))
       (SimplePattern-seqof ?pattern))
      ((and dest
            (record
             'setof
-            (list (app parse-SimplePattern (and ?pattern (not (== eof)))))))
+            (list
+             (app parse-SimplePattern (and ?pattern (not (== eof))))
+             _
+             ...)))
       (SimplePattern-setof ?pattern))
      ((and dest
            (record
             'dictof
             (list
              (app parse-SimplePattern (and ?key (not (== eof))))
-             (app parse-SimplePattern (and ?value (not (== eof)))))))
+             (app parse-SimplePattern (and ?value (not (== eof))))
+             _
+             ...)))
       (SimplePattern-dictof ?key ?value))
      ((app parse-Ref (and dest (not (== eof)))) (SimplePattern-Ref dest))
      (_ eof)))

implementations/racket/preserves/preserves-schema/parser.rkt

@@ -58,7 +58,8 @@
                                        ,(pattern->match-pattern fields-pat '_)))]
     [(CompoundPattern-tuple named-pats)
      (maybe-dest dest-pat-stx
-                 `(list ,@(map (lambda (p) (pattern->match-pattern p '_)) named-pats)))]
+                 `(list ,@(map (lambda (p) (pattern->match-pattern p '_)) named-pats)
+                        _ ...))]
     [(CompoundPattern-tuplePrefix fixed-named-pats variable-named-pat)
      (maybe-dest dest-pat-stx
                  (if (null? fixed-named-pats)

implementations/racket/preserves/preserves/pexprs.rkt

@@ -117,6 +117,7 @@
                               (match (peek-char in-port)
                                 [(or (? eof-object?) #\] #\> #\} #\)) *TRAILER-ANCHOR*]
                                 [_ (next)])))
+   #:interpreter-annotation (lambda (line) (record 'r (list 'interpreter line)))
    #:on-hash (lambda (in-port source next parse-error* default)
                (match-lambda
                  [#\{ (read-sequence 's in-port source next #\})]

implementations/racket/preserves/preserves/read-binary.rkt

@@ -83,7 +83,7 @@
         [#xB3 (string->symbol (bytes->string/utf-8 (next-bytes (next-varint))))]
         [#xB4 (apply (lambda (label . fields) (record label fields)) (next-items))]
         [#xB5 (next-items)]
-        [#xB6 (list->set (next-items))]
+        [#xB6 (build-set (next-items))]
         [#xB7 (build-dictionary (next-items))]
         [_ (return (on-fail "Invalid Preserves binary tag: ~v" lead-byte))]))
 
@@ -112,9 +112,17 @@
         ['#:end '()]
         [v (cons (wrap pos0 v) (next-items))]))
 
+    (define (build-set items)
+      (define s (list->set items))
+      (unless (= (set-count s) (length items)) (return (on-fail "Duplicate value in set")))
+      s)
+
     (define (build-dictionary items)
       (when (not (even? (length items))) (return (on-fail "Odd number of items in dictionary")))
-      (apply hash items))
+      (define h (apply hash items))
+      (unless (= (hash-count h) (quotient (length items) 2))
+        (return (on-fail "Duplicate key in dictionary")))
+      h)
 
     (let ((pos0 (pos)))
       (match (read-byte in-port)

implementations/racket/preserves/preserves/read-text-generic.rkt

@@ -70,9 +70,10 @@
     [(_ re pat) (app (lambda (v) (regexp-try-match re v)) pat)]))
 
 (define ((make-preserve-text-reader #:reader-name reader-name
+                                    #:interpreter-annotation interpreter-annotation
+                                    #:read-annotated-value read-annotated-value0
                                     #:on-char on-char0
-                                    #:on-hash on-hash0
-                                    #:read-annotated-value read-annotated-value0)
+                                    #:on-hash on-hash0)
          in-port source read-syntax? decode-embedded0)
   (define read-annotations? read-syntax?)
   (define decode-embedded (or decode-embedded0
@@ -106,6 +107,7 @@
       [#\# (match (next-char*)
              [(or #\space #\tab) (annotate-next-with (read-comment-line))]
              [(or #\newline #\return) (annotate-next-with "")]
+             [#\! (annotate-next-with (interpreter-annotation (read-comment-line)))]
              [#\f (unless (delimiter-follows?) (parse-error* "Delimiter must follow #f")) #f]
              [#\t (unless (delimiter-follows?) (parse-error* "Delimiter must follow #t")) #t]
              [#\" (read-literal-binary)]

implementations/racket/preserves/preserves/read-text.rkt

@@ -15,6 +15,7 @@
   (make-preserve-text-reader
    #:reader-name *reader-name*
    #:read-annotated-value (lambda (in-port source next parse-error*) next)
+   #:interpreter-annotation (lambda (line) `#s(interpreter ,line))
    #:on-hash (lambda (in-port source next parse-error* default)
                (match-lambda
                  [#\{ (sequence-fold in-port

implementations/racket/preserves/preserves/tests/samples.pr

@@ -14,7 +14,7 @@
   "In each test, let stripped = strip(annotatedValue),"
   "                  encodeBinary(·) produce canonical ordering and no annotations,"
   "                  looseEncodeBinary(·) produce any ordering, but with annotations,"
-  "                  annotatedBinary(·) produce canonical ordering, but with annotations,"
+  "                  annotatedBinary(·) produce “canonical ordering”, but with annotations,"
   "                  decodeBinary(·) include annotations,"
   "                  encodeText(·) include annotations,"
   "                  decodeText(·) include annotations,"
@@ -39,6 +39,10 @@
   }>
   "Implementations may vary in their treatment of the difference between expectations"
   "21/22 and 31/32, depending on how they wish to treat end-of-stream conditions."
+
+  "The idea of canonical-ordering-with-annotations is to encode, say, sets with their elements"
+  "in sorted order of their canonical annotationless binary encoding, but then actually"
+  "*serialized* with the annotations present."
 ]>
 <TestCases {
   annotation1: <Test #x"85 B103616263 B00109" @"abc" 9>
@@ -62,6 +66,10 @@
     <Test #x"85 B100 85 B1066e6f726d616c B000" #
 # normal
 0>
+  annotation12: @"Interpreter-specification annotations"
+    <Test #"\x85\xb4\xb3\x0binterpreter\xb1\x0a/some/path\x84\xb3\x05value"
+     #!/some/path
+     value>
   bytes2: <Test #x"B20568656c6c6f" #"hello">
   bytes2a: <Test @"Internal whitespace is allowed, not including commas" #x"B2 05 68 65 6c 6c 6f" #"hello">
   bytes2b: @"Commas forbidden in internal whitespace" <ParseError "#x\"B2, 05, 68, 65, 6c, 6c, 6f\"">
@@ -88,6 +96,7 @@
   dict2: @"Missing close brace" <ParseShort "{ a: b, c: d ">
   dict2a: @"Missing close brace" <ParseShort "{">
   dict3: @"Duplicate key" <ParseError "{ a: 1, a: 2 }">
+  dict3a: @"Duplicate key" <DecodeError #x"b7 b00101 b00102 b00101 b00103 84">
   dict4: @"Unexpected close brace" <ParseError "}">
   dict5: @"Missing value" <DecodeError #x"b7 b00101 b00102 b00103 84">
   dict6: @"Comma not allowed between key and colon" <ParseError "{ a,: 1, b: 2 }">
@@ -187,6 +196,7 @@
   set2: @"Missing close brace" <ParseShort "#{ 1 2 3 ">
   set2a: @"Missing close brace" <ParseShort "#{">
   set3: @"Duplicate value" <ParseError "#{a a}">
+  set3a: @"Duplicate value" <DecodeError #x"b6 b00101 b00101 84">
   string0: <Test #x"b100" "">
   string3: <Test #x"b10568656c6c6f" "hello">
   string4: <Test #x"b1 14 616263e6b0b4e6b0b45c2f22080c0a0d0978797a" "abc\u6c34\u6C34\\/\"\b\f\n\r\txyz">
@@ -221,6 +231,14 @@
   symbol12: <Test #x"b3042d2d2d31" ---1>
   symbol13: <Test #x"b3042b312e78" +1.x>
   symbol14: <Test #x"b304f09d849e" |\uD834\uDD1E|>
+  symbol15: @"A 130-byte symbol"
+            <Test #x"b3 8201
+                     6161616161616161616161616161616161616161616161616161616161616161
+                     6161616161616161616161616161616161616161616161616161616161616161
+                     6161616161616161616161616161616161616161616161616161616161616161
+                     6161616161616161616161616161616161616161616161616161616161616161
+                     6161"
+             aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa>
   tag0: @"Unexpected end tag" <DecodeError #x"84">
   tag1: @"Invalid tag" <DecodeError #x"10">
   tag2: @"Invalid tag" <DecodeError #x"61b10110">

implementations/racket/preserves/preserves/tests/test-pexprs.rkt

@@ -138,6 +138,16 @@ PrecType = "PREC" / "PREC_LEFT" / "PREC_RIGHT" / "PREC_DYNAMIC";
 ENDDOC
   )
 
+(define U #<<ENDDOC
+#!/example/of/a/shebang
+{
+    key: value
+    # example of a comment at the end of a dictionary
+}
+# example of a comment at the end of the input file
+ENDDOC
+  )
+
 (parameterize ((pretty-print-columns 80)) (write-pexprs (string->pexprs P #:read-syntax? #t)) (newline))
 (parameterize ((pretty-print-columns 10)) (write-pexprs (string->pexprs P #:read-syntax? #t)) (newline))
 
@@ -149,3 +159,5 @@ ENDDOC
 (parameterize ((pretty-print-columns 40)) (write-pexprs (string->pexprs S #:read-syntax? #t)) (newline))
 
 (parameterize ((pretty-print-columns 40)) (write-pexprs (string->pexprs T #:read-syntax? #t)) (newline))
+
+(parameterize ((pretty-print-columns 80)) (write-pexprs (string->pexprs U #:read-syntax? #t)) (newline))

preserves-binary.md

@@ -197,7 +197,7 @@ a binary-syntax document; otherwise, it should be interpreted as text.
      86 - Embedded
      87 - Double
 
-     B0 - Integer
+     B0 - SignedInteger
      B1 - String
      B2 - ByteString
      B3 - Symbol

preserves-expressions.md

@@ -3,7 +3,7 @@ title: "P-expressions"
 ---
 
 Tony Garnock-Jones <tonyg@leastfixedpoint.com>  
-February 2024. Version 0.3.1.
+May 2024. Version 0.3.2.
 
 [text syntax]: preserves-text.html
 
@@ -58,7 +58,7 @@ in that uses of `Value` are replaced with `SimpleExpr`.
 
            Embedded = "#:" SimpleExpr
           Annotated = Annotation SimpleExpr
-         Annotation = "@" SimpleExpr / "#" [(%x20 / %x09) linecomment] (CR / LF)
+         Annotation = "@" SimpleExpr / "#" [(%x20 / %x09/ %x21) linecomment] (CR / LF)
         linecomment = *<any unicode scalar value except CR or LF>
 
 P-expression special punctuation marks are comma, semicolon, and
@@ -223,12 +223,14 @@ text-syntax encodings.
 ### Whole `Document`s
 
 ```preserves
- ⌜{
+ ⌜#!/example/of/a/shebang
+  {
       key: value
       # example of a comment at the end of a dictionary
   }
   # example of a comment at the end of the input file⌝
-= [ <b
+= @<r interpreter "/example/of/a/shebang">
+  [ <b
         key <p |:|> value
         @"example of a comment at the end of a dictionary" <a>
     >

preserves-schema.md

@@ -4,7 +4,7 @@ title: "Preserves Schema"
 ---
 
 Tony Garnock-Jones <tonyg@leastfixedpoint.com>  
-December 2023. Version 0.3.5.
+April 2024. Version 0.4.
 
   [abnf]: https://tools.ietf.org/html/rfc7405
   [identifierlike]: #sufficiently-identifierlike-values
@@ -198,7 +198,15 @@ The right-hand-side of a definition may supply two or more *alternatives*.
 Alternatives are separated by any number of slashes `/`, and leading or
 trailing slashes are ignored. When parsing, the alternatives are tried in
 order; the result of the first successful alternative is the result of the
-entire parse.
+entire parse.[^extensibility-and-alternation]
+
+[^extensibility-and-alternation]: This ordered choice becomes important
+    when combined with the extensibility of e.g. record patterns: A pattern
+    `<a @b int> / <a @b int @c int>` will always match the left branch
+    because compound patterns match *prefixes* of records and tuples. A
+    better way to write it would be `<a @b int @c int> / <a @b int>`, which
+    tries the at-least-two-fields branch before falling back to the
+    at-least-one-field branch.
 
 **Host-language types.** The type corresponding to an `OrPattern` is an
 algebraic sum type, a union type, a variant type, or a concrete subclass
@@ -415,6 +423,18 @@ entry.
 
     DictionaryPattern = "{" *(value ":" NamedSimplePattern) "}"
 
+**Extensibility.** Each apparently fixed-size compound pattern over
+records, tuples or dictionaries actually only places a lower bound on the
+size of matching data. These patterns thus allow for extensibility by
+ignoring additional fields, elements, or dictionary entries. For example,
+the pattern `<a @value int>` will match not only `<a 123>` but also `<a 123
+"hello">`, while rejecting `<a>` or `<a [x y z]>`. Similarly, `{a: int, b:
+int}` matches `{a: 123, b: 234, c: [x y z]}` as well as `{a: 123, b: 234}`.
+Each compound pattern places constraints only on the *mentioned* elements
+of a datum, namely the leftmost fields of a record, the leftmost elements
+of a tuple, and the mentioned keys of a dictionary. Unmentioned elements
+are free to be present or absent.
+
 ### Identifiers and Bindings: NamedPattern and NamedSimplePattern
 
 Compound patterns specifications contain `NamedPattern`s or

preserves-text.md

@@ -294,6 +294,40 @@ the end of the line is included in the string annotating the `Value`.
 Comments that are just hash `#` followed immediately by newline yield an
 empty-string annotation.
 
+**Interpreter specification lines.** Unix systems specially interpret
+`#!` at the beginning of a file. For convenient use of Preserves syntax
+in Unix scripts, we define an interpretation for `#!` lines.
+
+       Annotation =/ "#!" linecomment (CR / LF)
+
+Such annotations are read as a record with label `interpreter` and with
+a single string field containing the text following the `!` and
+preceding the end of the line.[^printing-interpreter-specifications]
+[^multiple-interpreter-specifications]
+
+  [^printing-interpreter-specifications]: We encourage implementations
+    to *print* annotations of the form `<interpreter` *string*`>` using
+    the special `#!` syntax, as well, so long as the string does not
+    contain a carriage return or line feed character.
+
+  [^multiple-interpreter-specifications]: Annotations written with `#!`
+    are otherwise ordinary. In particular, *multiple* such lines are
+    nothing special. For example,
+
+    ```
+    #!/one
+    #!/two
+    # three
+    #!/four
+    five
+    ```
+
+    reads as
+
+    ```
+    @<interpreter "/one"> @<interpreter "/two"> @"three" @<interpreter "/four"> five
+    ```
+
 **Equivalence.** Annotations appear within syntax denoting a `Value`;
 however, the annotations are not part of the denoted value. They are
 only part of the syntax. Annotations do not play a part in

preserves.el

@@ -2,6 +2,7 @@
 
 ;; Add code like the following to your .emacs to install:
 ;; (autoload 'preserves-mode "~/src/preserves/preserves.el" nil t)
+;; (add-to-list 'auto-mode-alist '("\\.px\\'" . preserves-mode))
 ;; (add-to-list 'auto-mode-alist '("\\.pr\\'" . preserves-mode))
 ;; (add-to-list 'auto-mode-alist '("\\.prs\\'" . preserves-mode))
 

preserves.md

@@ -215,7 +215,7 @@ sequences use [the Preserves binary encoding](preserves-binary.html).
 The total ordering specified [above](#total-order) means that the following statements are true:
 
  - `"bzz"` < `"c"` < `"caa"` < `#:"a"`
- - `#t` < `3.0f` < `3.0` < `3` < `"3"` < `|3|` < `[]` < `#:#t`
+ - `#t` < `3.0` < `3` < `"3"` < `|3|` < `[]` < `#:#t`
  - `[#f]` < `[foo]`, because `Boolean` appears before `Symbol` in the kind ordering
  - `[x]` < `[x y]`, because there is no element remaining to compare against `y`
  - `[a b]` < `[x]`, because `a` is smaller than `x`
@@ -240,7 +240,6 @@ The total ordering specified [above](#total-order) means that the following stat
 | `0`                                                 | B0 00                                                                           |
 | `1`                                                 | B0 01 01                                                                        |
 | `255`                                               | B0 02 00 FF                                                                        |
-| `1.0f`                                              | 87 04 3F 80 00 00                                                               |
 | `1.0`                                               | 87 08 3F F0 00 00 00 00 00 00                                                   |
 | `-1.202e300`                                        | 87 08 FE 3C B7 B7 59 BF 04 26                                                   |
 | `#xd"fff0000000000000"`, negative `Double` infinity | 87 08 FF F0 00 00 00 00 00 00                                                   |
@@ -431,7 +430,7 @@ from each that is missing from the other. If the values are incompatible, they h
 
 **Examples.**
 
- - `merge [1, [2], 3] [1, [2, 99], 3, 4, 5] = merge [1, [2, 99], 3, 4, 5]`
+ - `merge [1, [2], 3] [1, [2, 99], 3, 4, 5] = [1, [2, 99], 3, 4, 5]`
  - `merge [1, 2, 3] [1, 5, 3] = ⊥`
  - `merge #{a, b, c} #{a, b, c} = ⊥`
  - `merge {a: 1, b: [2]} {b: [2, 99] c: 3} = {a: 1, b: [2, 99], c: 3}`

python/0.994.0/404.html

@@ -0,0 +1,498 @@
+
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+<html lang="en" class="no-js">
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+    </li>
+  
+
+    
+      
+      
+  
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="../values/" class="md-nav__link">
+        
+  
+  <span class="md-ellipsis">
+    Representations of Values
+  </span>
+  
+
+      </a>
+    </li>
+  
+
+    
+  </ul>
+</nav>
+                  </div>
+                </div>
+              </div>
+            
+            
+              
+              <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" >
+                <div class="md-sidebar__scrollwrap">
+                  <div class="md-sidebar__inner">
+                    
+
+<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
+  
+  
+  
+    
+  
+  
+    <label class="md-nav__title" for="__toc">
+      <span class="md-nav__icon md-icon"></span>
+      Table of contents
+    </label>
+    <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
+      
+        <li class="md-nav__item">
+  <a href="#preserves" class="md-nav__link">
+    <span class="md-ellipsis">
+      preserves
+    </span>
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#preserves.dumps" class="md-nav__link">
+    <span class="md-ellipsis">
+      dumps
+    </span>
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#preserves.loads" class="md-nav__link">
+    <span class="md-ellipsis">
+      loads
+    </span>
+  </a>
+  
+</li>
+      
+    </ul>
+  
+</nav>
+                  </div>
+                </div>
+              </div>
+            
+          
+          
+            <div class="md-content" data-md-component="content">
+              <article class="md-content__inner md-typeset">
+                
+                  
+
+  
+  
+
+
+<h1 id="the-top-level-preserves-package">The top-level preserves package</h1>
+
+
+<div class="doc doc-object doc-module">
+
+
+
+<a id="preserves"></a>
+  <div class="doc doc-contents first">
+  
+      <div class="highlight"><pre><span></span><code>import preserves
+</code></pre></div>
+<p>The main package re-exports a subset of the exports of its constituent modules:</p>
+<ul>
+<li>
+<p>From <a class="autorefs autorefs-internal" href="../values/#preserves.values">preserves.values</a>:</p>
+<ul>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.Annotated">Annotated</a></li>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.Embedded">Embedded</a></li>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.ImmutableDict">ImmutableDict</a></li>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.Record">Record</a></li>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.Symbol">Symbol</a></li>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.annotate">annotate</a></li>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.is_annotated">is_annotated</a></li>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.preserve">preserve</a></li>
+<li><a class="autorefs autorefs-internal" href="../values/#preserves.values.strip_annotations">strip_annotations</a></li>
+</ul>
+</li>
+<li>
+<p>From <a class="autorefs autorefs-internal" href="../error/#preserves.error">preserves.error</a>:</p>
+<ul>
+<li><a class="autorefs autorefs-internal" href="../error/#preserves.error.DecodeError">DecodeError</a></li>
+<li><a class="autorefs autorefs-internal" href="../error/#preserves.error.EncodeError">EncodeError</a></li>
+<li><a class="autorefs autorefs-internal" href="../error/#preserves.error.ShortPacket">ShortPacket</a></li>
+</ul>
+</li>
+<li>
+<p>From <a class="autorefs autorefs-internal" href="../binary/#preserves.binary">preserves.binary</a>:</p>
+<ul>
+<li><a class="autorefs autorefs-internal" href="../binary/#preserves.binary.Decoder">Decoder</a></li>
+<li><a class="autorefs autorefs-internal" href="../binary/#preserves.binary.Encoder">Encoder</a></li>
+<li><a class="autorefs autorefs-internal" href="../binary/#preserves.binary.canonicalize">canonicalize</a></li>
+<li><a class="autorefs autorefs-internal" href="../binary/#preserves.binary.decode">decode</a></li>
+<li><a class="autorefs autorefs-internal" href="../binary/#preserves.binary.decode_with_annotations">decode_with_annotations</a></li>
+<li><a class="autorefs autorefs-internal" href="../binary/#preserves.binary.encode">encode</a></li>
+</ul>
+</li>
+<li>
+<p>From <a class="autorefs autorefs-internal" href="../text/#preserves.text">preserves.text</a>:</p>
+<ul>
+<li><a class="autorefs autorefs-internal" href="../text/#preserves.text.Formatter">Formatter</a></li>
+<li><a class="autorefs autorefs-internal" href="../text/#preserves.text.Parser">Parser</a></li>
+<li><a class="autorefs autorefs-internal" href="../text/#preserves.text.parse">parse</a></li>
+<li><a class="autorefs autorefs-internal" href="../text/#preserves.text.parse_with_annotations">parse_with_annotations</a></li>
+<li><a class="autorefs autorefs-internal" href="../text/#preserves.text.stringify">stringify</a></li>
+</ul>
+</li>
+<li>
+<p>From <a class="autorefs autorefs-internal" href="../compare/#preserves.compare">preserves.compare</a>:</p>
+<ul>
+<li><a class="autorefs autorefs-internal" href="../compare/#preserves.compare.cmp">cmp</a></li>
+</ul>
+</li>
+<li>
+<p>From <a class="autorefs autorefs-internal" href="../merge/#preserves.merge">preserves.merge</a>:</p>
+<ul>
+<li><a class="autorefs autorefs-internal" href="../merge/#preserves.merge.merge">merge</a></li>
+</ul>
+</li>
+</ul>
+<p>It also exports the <a class="autorefs autorefs-internal" href="../compare/#preserves.compare">compare</a> and <a class="autorefs autorefs-internal" href="../fold/#preserves.fold">fold</a> modules themselves,
+permitting patterns like</p>
+<div class="highlight"><pre><span></span><code><span class="o">&gt;&gt;&gt;</span> <span class="kn">from</span> <span class="nn">preserves</span> <span class="kn">import</span> <span class="o">*</span>
+<span class="o">&gt;&gt;&gt;</span> <span class="n">compare</span><span class="o">.</span><span class="n">cmp</span><span class="p">(</span><span class="mi">123</span><span class="p">,</span> <span class="mi">234</span><span class="p">)</span>
+<span class="o">-</span><span class="mi">1</span>
+</code></pre></div>
+<p>Finally, it provides a few utility aliases for common tasks:</p>
+
+  
+
+  <div class="doc doc-children">
+
+
+
+
+
+
+
+<div class="doc doc-object doc-attribute">
+
+
+
+<h2 id="preserves.dumps" class="doc doc-heading">
+          <code class="highlight language-python"><span class="n">dumps</span> <span class="o">=</span> <span class="n">stringify</span></code>
+  
+  <span class="doc doc-labels">
+      <small class="doc doc-label doc-label-module-attribute"><code>module-attribute</code></small>
+  </span>
+
+</h2>
+
+
+  <div class="doc doc-contents ">
+  
+      <p>This alias for <code>stringify</code> provides a familiar pythonesque name for converting a Preserves <code>Value</code> to a string.</p>
+  </div>
+
+</div>
+
+<div class="doc doc-object doc-attribute">
+
+
+
+<h2 id="preserves.loads" class="doc doc-heading">
+          <code class="highlight language-python"><span class="n">loads</span> <span class="o">=</span> <span class="n">parse</span></code>
+  
+  <span class="doc doc-labels">
+      <small class="doc doc-label doc-label-module-attribute"><code>module-attribute</code></small>
+  </span>
+
+</h2>
+
+
+  <div class="doc doc-contents ">
+  
+      <p>This alias for <code>parse</code> provides a familiar pythonesque name for converting a string to a Preserves <code>Value</code>.</p>
+  </div>
+
+</div>
+
+
+
+
+
+  </div>
+
+  </div>
+
+</div>
+
+
+
+
+
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