New submission from Benjamin Peterson <benja...@python.org>:

The isupper() and islower() methods currently use the Lowercase and Uppercase 
derived properties. Technically, they should use the 
Changes_When_(Lowercased/Uppercased/Titlecased) and Changes_When_Casemapped 
derived properties to compute their results.

----------
components: Unicode
messages: 151606
nosy: benjamin.peterson, ezio.melotti
priority: normal
severity: normal
status: open
title: is(upper/lower/title) are not exactly correct
versions: Python 3.3

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13822>
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