Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Converting to unsigned int can unnecessary widen the value or truncate higher 
bits. On other side, testing "0 <= (c)" can emit a compiler warning if c is 
unsigned.

Maybe test "Py_CHARMASK(c) == (c)"?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35194>
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