[issue25937] DIfference between utf8 and utf-8 when i define python source code encoding.

[STINNER Victor]

STINNER Victor added the comment:

In Python, there are multiple implementations of the utf-8 codec with many
shortcuts. I'm not surprised to see bugs depending on the exact syntax of
the utf-8 codec name. Maybe we need to share even more code to normalize
and compare codec names. (I think that py3 is better than py2 on this part.)

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<http://bugs.python.org/issue25937>
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