[issue4213] Lower case file system encoding

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Converting to the lower case doesn't solve the problem: if the locale 
is "utf8" and Python checks for "utf-8", the optimization will fail. 
Another example: iso-8859-1, latin-1 or latin1?

A correct patch would be to get the most common name of the charset 
and make sure that Python C code always use this name.

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nosy: +haypo

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<http://bugs.python.org/issue4213>
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