Could you elaborate? How does type erasure relate to HKT?
> Of course it could be implemented type-erased style, but that's an unpleasant can of worms.
> If it were implemented like C++ templates, it would be a source level feature, meaning you can't have higher kinded polymorphic methods in assemblies. I think we can reach consensus that such a feature would only pollute the language.
> If it were implemented like Java generics, it would lead to all sorts of nonsense. For example you couldn't do typeof(M<>) inside the hkpm, since the type has been erased.
And then a complex-but-good implementation idea follows. Type erasure is not necessary in this case.
Plus the only reason type erasure is bad is if you want reflection. Which in FP languages with a solid type system isnt idiomatic and safe anyway. Edit: value types are one other reason for not using erasure but Can be done other ways