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and in regular Haskell you can get something like polymorphism (implemented under the hood with actual polymorphism) with forall-qualified datatypes.

Huh? Haskell's polymorphism capabilities are more expressive and more expansive than most other languages'. Higher-kinded polymorphism, a mainstay in Haskell, is pretty rare to find almost anywhere else.



I meant dynamic polymorphism, which is different from parametric polymorphism.




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