Why must Json<T> be the last Axum handler argument when other arguments read request part…

Why must Json<T> be the last Axum handler argument when other arguments read request parts?

1. Json<T> consumes the request body through FromRequest, while earlier FromRequestParts extractors can share request parts.
2. Rust evaluates all function arguments from right to left.
3. Serde can deserialize only the final field of a tuple.