[issue12451] open: avoid the locale encoding when possible

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset c4388478f9b2 by Victor Stinner in branch 'default':
Issue #12451: Open the test file in binary mode in test_bz2, the text file is
http://hg.python.org/cpython/rev/c4388478f9b2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12451>
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