deser: an experimental serialization and deserialization library for Rust

Deser is an experimental serialization system for Rust. It wants to explore the possibilities of serialization and deserialization of structural formats such as JSON or msgpack. It intentionally does not desire to support non self describing formats such as bincode.

This is not a production ready yet.

```rust use deser::{Serialize, Deserialize};

[derive(Debug, Serialize, Deserialize)]

[deser(rename_all = "camelCase")]

pub struct Account { id: usize, accountholder: String, isdeactivated: bool, } ```

This generates out the necessary Serialize and Deserialize implementations.

To see some practical examples of this have a look at the examples.

Design Goals

Fast Compile Times: deser avoids excessive monomorphization by encouraging dynamic dispatch.
Unlimited Recursion: the real world is nasty and incoming data might be badly nested. Do not exhaust the call stack no matter how deep your data is. It accomplishes this by an alternative trait design to serde where handles to "sinks" or "serializable" objects are returned. This means that it's up to the caller to manage the recursion.
Simple Data Model: deser simplifies the data model on the serialization and deserialization interface. For instance instead of making a distinction between u8 and u64 they are represented the same in the model. To compensate for this, it provides type descriptors that provide auxiliary information for when a serializer wants to process it.
Meta Information: deser compensates the simplified data model with providing a space to hold meta information. This for instance can be used to automatically keep track of the "path" to the current structure during serialization and deserialization.
Native Byte Serialization: deser has built-in specialization for serializing bytes and byte vectors as distinct formats from slices and vectors.

Future Plans

Extensible Data Model: deser wants to make it possible to extend the data model with types that are not native to the serialization interface. For instance if a data format wants to support arbitrarily sized integers this should be possible without falling back to in-band signalling.

Crates

deser: the core crate providing the base functionality
deser-json: basic JSON implementation for deser
deser-path: a crate that extends deser to track the path during serialization
deser-debug: formats a serializable to the std::fmt debug format

Inspiration

This crate heavily borrows from miniserde, serde and Sentry Relay's meta system. The general trait design was modelled after miniserde.

In particular for the relationship to Serde there is a Serde Learnings document providing more details.

Safety

Deser (currently) uses excessive amounts of unsafe code internally. It is not vetted and it is likely completely wrong. If this design turns out to be useful there will be need to be a re-design of the internals.