Once we sort these out, any that impact Python 3.4 (like the PyType_FromSpecAndBases one) should be backported to the maintenance branch.

I wouldn't assume the one you found in PyType_FromSpecAndBases is the only one, though - I believe the tests for this PEP are managing to exercise parts of the module cleanup machinery that it's never been practical to properly test in the past.

And now I really am heading to bed :)