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

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

unicode methods center(), ljust(), rjust() use a callback (convert_uc) 
to get an unicode character (unicode string of 1 character). If 'C' is 
fixed, convert_uc() callback can be removed.

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