[issue37752] Redundant Py_CHARMASK called in normalizestring(codecs.c)

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

Or remove Py_CHARMASK in Py_ISxxx/Py_TOLOWER/Py_TOUPPER macros?
Sometimes `c` is already a unsinged char, Py_CHARMASK is not necessary in these cases.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37752>
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