Calling __new__ via super()

[JukkaL]

Mypy complains about this code, even though it's okay:

class A:
    def __new__(cls, x: int) -> 'A':
        return object.__new__(cls)

class B(A):
    def __new__(cls, x: str) -> 'B':
        return super().__new__(cls, int(x))  # Too many arguments for "__new__" of "A"

print(B('3'))