This is a strange case. It looks like “iterable” is half-supported as a keyword argument. So Silent Ghost’s patch fixes the signature, but the code still tries to accept keyword arguments:

>>> sorted(iterable=None)
TypeError: 'NoneType' object is not iterable
>>> sorted(iterable=())
TypeError: 'iterable' is an invalid keyword argument for this function

The problem is that sorted() blindly passes the keyword arguments to list.sort(). I guess we could delete "iterable" from them, but maybe it is not worth the trouble.