[issue3359] add 'rbU' mode to open()

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

At least the 2.6 docs say

"The default is to use text mode, which may convert ``'\n'`` characters
to a platform-specific representation on writing and back on reading."

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<http://bugs.python.org/issue3359>
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