[GrumpySloth]

Yup. I consider runtime reflection an antifeature, which has negative performance effects, is unsafe (see e.g. log4j) and leads to fragile code.

I would however welcome static reflection with open arms. In Rust in particular, I’d prefer it if derive was implemented using static reflection, rather than proc macros.

[lmm]

Derive or equivalent ought to be something you can implement on top of frunk (so you're ultimately still depending on a proc macro, but the whole ecosystem only needs to depend on that one macro, and tools etc. can build in support for it) - that's how it's usually done in Scala.