Adding Trace/Finalize impls for other crates

[remexre]

Is there a way to ergonomically add impls for other crates? Possibly via optional deps on e.g. either, void, smallvec, etc.

[TyOverby]

I think it would make more sense for those crates to support it via features

[neeldug]

Would it be possible to implement this, to allow for other crates to add impls for other crates via wrapping?

[andersk]

@neeldug The suggestion at that link doesn’t make sense.