Incorrectly decorating implicit arguments gives inconsistent results

[k2bd]

For example, calling the following methods may or may not raise a ParameterTypeError. Methods 1 and 3 pass, method 3 fails.

class ExClass:
    @enforce_type_hints
    def method1(self: int):
        pass

    @classmethod
    @enforce_type_hints
    def method2(cls: int):
        pass

    @enforce_type_hints
    @classmethod
    def method3(cls: int):
        pass