Right nowTarFile.__init__ is defined as:

Which is not exactly right, because there's a case whenname andfileobj are bothNone at the same time. And this will lead to runtime errors:

>>>importtarfile>>>tarfile.TarFile(None,fileobj=None)Traceback (mostrecentcalllast):File"<python-input-2>",line1,in<module>tarfile.TarFile(None,fileobj=None)~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^File"/Users/sobolev/Desktop/cpython/Lib/tarfile.py",line1729,in__init__fileobj=bltn_open(name,self._mode)TypeError:expectedstr,bytesoros.PathLikeobject,notNoneType

Right now mypy does not raise any errors for this broken case:https://mypy-play.net/?mypy=latest&python=3.12&gist=7452d274249fafba1f8a16565d5486c6

We need eithername orfileobj, they can be bothNone at the same time. So, we need to add overloads.

There are several other methods that needs to be updated likeopen andtaropen, maybe others.