In order to resolve bpo41073, we want to extend `PyType_GetSlot()` to accept static types. But there have another question we should be considered: How many slots should be exposed in `PyType_GetSlot()`.

petr's opinion from PR-21931:I would not want to expose the Py_tp_as_* slots at all; their contents are covered in other slots that should be used instead. And slots like Py_tp_version_tag are specific to CPython; I don't think they should be exposed in the general C API.