Method __subclasscheck__

Lib/typing.py:3928–3933

(self, cls)

                return super().__instancecheck__(inst)

            def __subclasscheck__(self, cls):
                import warnings
                warnings._deprecated(
                    f"{self.__module__}.{self._name}", remove=self._removal_version
                )
                return super().__subclasscheck__(cls)

        with warnings.catch_warnings(
            action="ignore", category=DeprecationWarning