Rich value wrapper for Rust

The Rich wrapper type represents a value with some attached metadata. This is a fairly simple type that could be defined locally in your project. The goal of this library is to provide various helper methods to make it more convenient to manipulate such values.

An important use-case for this library is to track metadata for config values, such as the source where a value is coming from. The serde_rich crate provides integration with serde to collect deserialization information.