[issue11303] b'x'.decode('latin1') is much slower than b'x'.decode('latin-1')

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

In issue11303.diff, I add similar optimization for encode('latin1') and for 'utf8' variant of utf-8.  I don't think dash-less variants of utf-16 and utf-32 are common enough to justify special-casing.

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Added file: http://bugs.python.org/file20872/issue11303.diff

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