Repair error in Decoder.nextbytes

implementations/javascript/package.json

@@ -1,6 +1,6 @@
 {
   "name": "preserves",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "Experimental data serialization format",
   "homepage": "https://gitlab.com/tonyg/preserves",
   "license": "MIT",

implementations/javascript/src/codec.js

@@ -56,7 +56,7 @@ class Decoder {
     const start = this.advance(n);
     if (this.index > this.packet.length) throw new DecodeError("Short packet");
     // ^ NOTE: greater-than, not greater-than-or-equal-to.
-    return new DataView(this.packet.buffer, start, n);
+    return new DataView(this.packet.buffer, this.packet.byteOffset + start, n);
   }
 
   nextvalues(n) {

implementations/javascript/test/test-codec.js

@@ -141,3 +141,11 @@ describe('hex samples', () => {
     });
   });
 });
+
+describe('parsing from subarray', () => {
+  it('should maintain alignment of nextbytes', () => {
+    const u = Uint8Array.of(57, 57, 57, 57, 83, 51, 51, 51);
+    const bs = Bytes.from(u.subarray(4));
+    expect(new Decoder(bs).next()).to.equal("333");
+  });
+});