[issue18530] posixpath.ismount performs extra lstat calls

[Brian Curtin]

Brian Curtin added the comment:

Benjamin probably has the final say on backporting this to 2.7. I'm doing the 3.3/default commit right now.

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nosy: +brian.curtin

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18530>
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