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kotlinlang

Retrofit question.

I have just found than in R8/fullmode when I have

```interface Service {
  suspend fun fetch(): Response
}```
and then I call `service.fetch()` and *do not use* the response, R8 fully strips out Response class from apk, replaces it with Any and Retrofit + kotlin.serialization complain that no converter/serializer for response are found.

I tried using Retrofit's proguard rules from github's master, but the error is still there.

Does it mean that rules are incomplete? Should I file a bug? I could do a PR, but I'd have to read up on R8/Proguard for this.