[vbrandl]

I guess you are talking about this `Visitor` trait [0]. I have only used serde in combination with the derive macros so please enlighten me, but each `visit_* ` function of the `Visitor` trait already takes a typed value (`bool`, integer types, ...) so these already have too be parsed (instantiated?) from the input string/bytes. Couldn't you have an `SerdeTypes` enum that implements `From` for each `visit_* ` type to remove some boilerplate and then use pattern matching? Could you elaborate where there would be overhead?

Don't get me wrong. I'm sure, the serde developers know better than me and have good reasons to implement it the way they did, but I'd like to understand the rational behind the decision.

Edit: formatting

[0]: https://github.com/serde-rs/serde/blob/master/serde/src/de/m...