[issue3931] codecs.charmap_build is untested and undocumented

[Mark Lawrence]

Mark Lawrence added the comment:

msg120987 states the opposite to msg112747 so what do we do with this issue?

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nosy: +BreamoreBoy
versions: +Python 3.4, Python 3.5 -Python 3.2, Python 3.3

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<http://bugs.python.org/issue3931>
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