[issue15535] Fix pickling efficiency of named tuples in 2.7.3

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


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priority: release blocker -> normal
resolution: fixed -> 
status: closed -> open
versions:  -Python 3.2, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15535>
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