[issue5499] only accept byte for getarg('c') and unicode for getarg('C')

[Hirokazu Yamamoto]

Hirokazu Yamamoto <ocean-city at m2.ccsnet.ne.jp> added the comment:

Note: #5391 and #5410 are depends on this issue.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5499>
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