[issue28112] Add callback to functools.lru_cache

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +ncoghlan, rhettinger
stage:  -> needs patch
versions:  -Python 3.3, Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28112>
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