[issue9036] Simplify Py_CHARMASK

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Thus,
> ((unsigned char)((c) & 0xff)) and ((unsigned char)(c)) should produce
> the same results.

If it's the case, it's probably optimized away by the compiler anyway.

> There is no reason not to do the cast when __CHAR_UNSIGNED__ is
> defined (it will be a no-op).

Agreed. It also reduces the opportunity for bugs :)

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<http://bugs.python.org/issue9036>
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