[issue18183] Calling .lower() on certain unicode string raises SystemError

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

>>> a = chr(0x84b2e)+chr(0x109710)
>>> a.lower()
SystemError: invalid maximum character passed to PyUnicode_New

The MAX_MAXCHAR() macro only works for 'maxchar' values, like 0xff, 0xffff...  in do_upper_or_lower() it's used with arbitrary UCS4 values.

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nosy: +amaury.forgeotdarc, haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18183>
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