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The mappingproxy functions are defined as static in https://github.com/python/cpython/blob/3.7/Objects/descrobject.c#L806 and tbh, dunno what's the point is with _Py_IDENTIFIER(keys) and _PyObject_CallMethodId for example in mappingproxy_keys so went directly to the source in abstracts by checking _Py_IDENTIFIER(keys) in https://github.com/python/cpython/blob/088b63ea7a8331a3e34bc93c3b873c60354b4fad/Tools/c-analyzer/known.tsv#L1212 etc.. https://github.com/python/cpython/blob/4a21e57fe55076c77b0ee454e1994ca544d09dc0/Objects/abstract.c#L2303
Anyway, everything works as expected and so on.
Usage