[docs] [issue12204] str.upper converts to title

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

It's unlikely that #12266 might break apps.  The behavior changed only for fairly unusual characters, and the old behavior was clearly wrong.
FWIW the str.capitalize() implementation of PyPy doesn't have the bug, and after the fix both CPython and PyPy have the same behavior.

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<http://bugs.python.org/issue12204>
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