[issue9873] Allow bytes in some APIs that use string literals internally

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

>From the python-dev thread (http://mail.python.org/pipermail/python-dev/2010-September/103780.html):
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So the domain of any polymorphic text manipulation functions we define would be:
 - Unicode strings
 - byte sequences where the encoding is either:
   - a single byte ASCII superset (e.g. iso-8859-*, cp1252, koi8*, mac*)
   - an ASCII compatible multibyte encoding (e.g. UTF-8, EUC-JP)

Passing in byte sequences that are encoded using an ASCII incompatible
multibyte encoding (e.g. CP932, UTF-7, UTF-16, UTF-32, shift-JIS,
big5, iso-2022-*, EUC-CN/KR/TW) or a single byte encoding that is not
an ASCII superset (e.g. EBCDIC) will have undefined results.
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<http://bugs.python.org/issue9873>
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