[issue13748] Allow rb"" literals as an equivalent to br""

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> I would be happier if there was precedent for this with "ur" = "ru" in
> 2.x, which is not true.

In my experience, raw unicode literals were very rare while raw bytes
literals are quite frequent (mainly for regular expressions).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13748>
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