Benjamin Peterson added the comment:
The full case mappings do not preserve normalization form.
>>> for c in 'ΰ'.upper().lower(): print(unicodedata.name(c))
...
GREEK SMALL LETTER UPSILON
COMBINING DIAERESIS
COMBINING ACUTE ACCENT
>>> unicodedata.normalize('NFC', 'ΰ'.upper().lower()) == 'ΰ'
True
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12736>
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