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Following a discussion on reddit it seems that the unicode case
conversion algorithms are not being followed.
$ python3.0
Python 3.0rc1 (r30rc1:66499, Oct 10 2008, 02:33:36) 
[GCC 4.0.1 (Apple Inc. build 5488)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> x='ß'
>>> print(x, x.upper())
ß ß
This conversion is correct as defined in UnicodeData.txt however
http://unicode.org/Public/UNIDATA/SpecialCasing.txt defines a more
complete set of case conversions.
According to this file "ß".upper() should be "SS". Presumably Python
simply isn't using this file to create it's mapping database.