[issue13788] os.closerange optimization

[Charles-François Natali]

Changes by Charles-François Natali <neologix at free.fr>:


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resolution:  -> duplicate
stage:  -> committed/rejected
status: open -> closed
superseder:  -> subprocess close_fds behavior should only close open fds

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13788>
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