Never gonna happen - the fundamental premise of the language is duck typing.

Either you add type hints to your function and should expect it to be type checked, or you don’t add type hints and remain free to use duck typing as you want.

But not receiving as much as a warning when you violate type hints is the worst of both worlds.

Duck typing isn’t completely incompatible with type checking btw. Haskells type classes are an elegant solution to that, for example.