[issue39117] Performance regression for making bound methods

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

By the way, in sorted(data, key=str.upper): str.upper is an unbound method, no?

$ ./python
Python 3.9.0a6+ (heads/master:d9a43e20fa, Apr 28 2020, 23:50:37) 
>>> type(str.upper)
<class 'method_descriptor'>

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<https://bugs.python.org/issue39117>
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