[issue6799] mimetypes does not give cannonical extension for guess_extension with text/plain

[Chris Lambacher]

Chris Lambacher <chris at kateandchris.net> added the comment:

This is a dup of #1043134

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nosy: +lambacck

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6799>
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