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You are right, I misinterpreted "use". I cloned the the PEP 3155 repo and ran my test script (I’ll attach it for reference) and reprs/strs are indeed "<class '__main__.A.B'>" and "<function makestrip.<locals>.strip at ...>", so this request is not obsoleted.
I’ve updated my patch to use qualnames for str(cls) and str(func). As I reported before, if I want str(sys.exc_info) to be 'exc_info', then Python unbound methods (i.e. functions) are affected:
 <method 'update' of 'dict' objects>
 <built-in method update of dict object at ...>
 <method 'tolist' of 'array.array' objects>
 <built-in method tolist of array.array object at ...>
 → Counter.update
 <bound method Counter.update of Counter()>
 → Top.Nested.method # this checks qualnames are used
 <bound method Nested.method of <__main__.Top.Nested object at ...>
It seems to me that this is not a problem: Python 3 unbound methods *are* functions. If you decide that having str(method) unchanged for all kinds of methods is more important than giving all kinds of functions a short str, I can do it.