diff --git a/implementations/rust/preserves-serde/src/error.rs b/implementations/rust/preserves-serde/src/error.rs
index 0e24fbb..ad2e9e5 100644
--- a/implementations/rust/preserves-serde/src/error.rs
+++ b/implementations/rust/preserves-serde/src/error.rs
@@ -1,54 +1,26 @@
-use num::bigint::BigInt;
 use std::convert::From;
 use std::io;
 
 #[derive(Debug)]
 pub enum Error {
-    Io(io::Error),
+    Preserves(preserves::Error),
     Message(String),
     InvalidUnicodeScalar(u32),
-    NumberOutOfRange(BigInt),
     CannotDeserializeAny,
-    MissingCloseDelimiter,
-    MissingItem,
-    Expected(ExpectedKind),
+    ExpectedOption,
+    ExpectedUnicodeScalar,
 }
 
-#[derive(Debug, PartialEq)]
-pub enum ExpectedKind {
-    Boolean,
-    Float,
-    Double,
-
-    SignedIntegerI128,
-    SignedIntegerU128,
-    SignedInteger,
-    String,
-    ByteString,
-    Symbol,
-
-    Record,
-    SimpleRecord(String),
-    Sequence,
-    Set,
-    Dictionary,
-
-    Embedded,
-
-    Option,
-    UnicodeScalar,
-}
-
-impl From<io::Error> for Error {
+impl From<preserves::Error> for Error {
     fn from(e: io::Error) -> Self {
-        Error::Io(e)
+        Error::Preserves(e)
     }
 }
 
 impl From<Error> for io::Error {
     fn from(e: Error) -> Self {
         match e {
-            Error::Io(ioe) => ioe,
+            Error::Preserves(p) => p.into(),
             Error::Message(str) => io::Error::new(io::ErrorKind::Other, str),
             _ => io::Error::new(io::ErrorKind::Other, e),
         }
@@ -74,35 +46,3 @@ impl std::fmt::Display for Error {
         write!(f, "{:?}", self)
     }
 }
-
-//---------------------------------------------------------------------------
-
-pub fn is_io_error(e: &Error) -> bool {
-    matches!(e, Error::Io(_))
-}
-
-pub fn eof() -> Error {
-    Error::Io(io_eof())
-}
-
-pub fn is_eof_error(e: &Error) -> bool {
-    if let Error::Io(ioe) = e {
-        is_eof_io_error(ioe)
-    } else {
-        false
-    }
-}
-
-//---------------------------------------------------------------------------
-
-pub fn io_eof() -> io::Error {
-    io::Error::new(io::ErrorKind::UnexpectedEof, "EOF")
-}
-
-pub fn is_eof_io_error(e: &io::Error) -> bool {
-    matches!(e.kind(), io::ErrorKind::UnexpectedEof)
-}
-
-pub fn is_syntax_io_error(e: &io::Error) -> bool {
-    matches!(e.kind(), io::ErrorKind::InvalidData)
-}
diff --git a/implementations/rust/preserves-serde/src/value/de.rs b/implementations/rust/preserves-serde/src/value/de.rs
index f7ab56b..e94ed4d 100644
--- a/implementations/rust/preserves-serde/src/value/de.rs
+++ b/implementations/rust/preserves-serde/src/value/de.rs
@@ -1,5 +1,5 @@
 use preserves::{Value, IOValue, Map, ValueImpl};
-//use crate::error::Error;
+use crate::error::Error;
 use serde::Deserialize;
 use serde::de::{Visitor, SeqAccess, MapAccess, EnumAccess, VariantAccess, DeserializeSeed};
 use std::iter::Iterator;
@@ -32,8 +32,8 @@ impl<'de, 'a> serde::de::Deserializer<'de> for &'a mut Deserializer<'de>
         let v = self.input.value();
         match v {
             Value::Boolean(b) => visitor.visit_bool(*b),
-            Value::Float(Float(f)) => visitor.visit_f32(*f),
-            Value::Double(Double(d)) => visitor.visit_f64(*d),
+            Value::Float(f) => visitor.visit_f32(*f),
+            Value::Double(d) => visitor.visit_f64(*d),
             Value::String(s) => visitor.visit_str(&s),
             Value::ByteString(_) => self.deserialize_bytes(visitor),
             Value::Record(_) =>
diff --git a/implementations/rust/preserves-serde/src/value/magic.rs b/implementations/rust/preserves-serde/src/value/magic.rs
index b9bb525..587f405 100644
--- a/implementations/rust/preserves-serde/src/value/magic.rs
+++ b/implementations/rust/preserves-serde/src/value/magic.rs
@@ -1,3 +1,5 @@
+use preserves::IOValue;
+
 pub static MAGIC: &str = "$____Preserves_Serde_Magic";
 
 struct IOValueVisitor;
@@ -54,18 +56,6 @@ where F: FnOnce() -> Result<IOValue, crate::error::Error>
 // This part is a terrible hack
 
 
-impl serde::Serialize for UnwrappedIOValue {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
-        super::magic::output_value(serializer, self.clone().wrap())
-    }
-}
-
-impl<'de> serde::Deserialize<'de> for UnwrappedIOValue {
-    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: serde::Deserializer<'de> {
-        Ok(super::magic::input_value::<'de, D>(deserializer)?.value_owned())
-    }
-}
-
 impl serde::Serialize for IOValue {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
         super::magic::output_value(serializer, self.clone())