[issue6117] Fix O(n**2) performance problem in socket._fileobject

[Kristján Valur Jónsson]

Changes by Kristján Valur Jónsson <kristjan at ccpgames.com>:


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stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6117>
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