David Tolnay

Support default literals

35

``` rust #[serde(default="0.1")] pub n: f32 ``` There is an ambiguity when the field is of function type so we need to figure that out.

Document whether len passed to Serializer::serialize_struct includes skipped fields

1

The documentation for [Serializer::serialize_struct](https://docs.rs/serde/1.0/serde/trait.Serializer.html#tymethod.serialize_struct) currently says: > `len` is the number of data fields that will be serialized. This implies that the count of skipped field is not to be...

Path to errors

8

Newer versions of Jackson are really helpful about giving you the full path to the thing that errored out. See if this is something we can do with minimal performance...

Ability to step past errors in StreamDeserializer if input is valid JSON

5

The current behavior of StreamDeserializer is that if it hits an error, that same error is returned in perpetuity which is typically not what you want. (If that _is_ what...

Support using DeserializeSeed with StreamDeserializer

2

Currently the stream API looks like: ```rust impl where R: Read, { type Item = Result; fn next(&mut self) -> Option; } ``` There should be some way to pass...

Parsing 20MB file using from_reader is slow

10

It takes 750 ms to deserialize [these types](https://github.com/mitsuhiko/rust-sourcemap/blob/170f026fe34eac03275891a04254a8eb2bf84642/src/jsontypes.rs.in) while json.load in python takes 300 ms. Reported by @mitsuhiko in IRC.

Support deserializing f32 and f64 from null

13

Currently f32::NAN and f64::NAN get serialized as null but fail to deserialize back as NAN. cc @sfackler

Currently an invocation like `json!({ "x": 0, "y": 'y' as i8, "z": [] })` expands into: ```rust ::serde_json::Value::Object({ let mut object = ::serde_json::Map::new(); let _ = object.insert(...); let _ =...

Provide a way for StreamDeserializer to stream an array of values

13

It seems like a common situation to have a [large](https://github.com/serde-rs/json/issues/403) top-level array in a JSON file. ```rust [ {...}, {...}, {...}, ... ] ``` StreamDeserializer should expose a way to...

Errors from Visitor should point to beginning of the object

2

In the following string validation, the error message points to the close quote after "test123". It would be nicer to point to the opening quote instead. ```rust #[macro_use] extern crate...