liushuyu/value-trait

The value-trait project provides a set of building blocks for Rust programmers who need to work with JSON-like data. Think of it as defining a common blueprint or interface that different data containers can follow, so they all understand how to represent the kinds of values you find in JSON, things like strings, numbers, arrays, objects, booleans, and null. At a technical level, Rust uses a concept called "traits," which are essentially contracts that types can sign. By signing the contract, a type promises to implement certain behaviors. This crate gathers together traits specifically designed for JSONesque values. A library author can build a custom data structure, say, a highly optimized JSON parser, and implement these traits. Once they do, that custom structure can plug into other tools in the ecosystem that expect values matching this same contract. This matters because JSON parsing in performance-critical Rust applications is an active area of optimization. The project lives under the simd-lite umbrella, which hints that the broader goal involves using specialized CPU instructions to parse JSON as fast as possible. Library and tool authors building high-performance JSON parsers or serializers would use these trait definitions so their implementations remain compatible with a wider ecosystem of Rust JSON tooling. The README itself is quite sparse and doesn't go into detail beyond describing the collection of traits. There's no usage guide, no examples, and no breakdown of which specific traits are included. What is clear is the project's role: it serves as a foundational layer that other, more user-facing JSON libraries build on top of, rather than something an application developer would use directly.