[ObscureScience]

I did not catch from you comment if you knew, but "sound" and "unsound" are specific concepts in type theory, and they are binary properties. A system either is or is not sound.

[valenterry]

Yeah I know that.

So: > This makes union types unsound in the presence of type parameters/generics.

Sounds a bit strange to me. Why would union types + type parameters be generally unsafe? I doubt that that's true.