Chris Jerdonek added the comment:

Yes, the documentation for str.casefold() suggests that lower() is not meant to 
casefold:

"For example, the German lowercase letter 'ß' is equivalent to "ss". Since it 
is already lowercase, lower() would do nothing to 'ß'; casefold() converts it 
to "ss"."

http://docs.python.org/dev/library/stdtypes.html#str.casefold

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nosy: +cjerdonek

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