Antoine Pitrou <pit...@free.fr> added the comment:

Well, that's what BytesWarning is for. I agree it is annoying in normal use, 
but it is meant to ease porting of 2.x code. That's why it is only enabled when 
you use the corresponding command-line switch.

The warning in the dict case is especially important: otherwise it is easy to 
get a dict with duplicate bytes and unicode keys (say b"xxx" and "xxx"), and 
potentially different values.

----------
nosy: +pitrou
resolution:  -> rejected
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9636>
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