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Fri Sep 20 15:36:45 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-September/128812.html

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On 20/09/13 15:31, Antoine Pitrou wrote:
> sys.intern is an internal interpreter optimization and should be 
> orthogonal to pickling. If pickle can't detect already-seen bytes 
> object, then you may file an improvement request on the bug
> tracker.

Understood. Thanks for the clarification.

Pickle manage correctly "same object" references, but not "different
objects but equivalent". That is the issue. But for most uses this is
not a problem, and implementing this redundance removal looks like a
performance cost that few users would benefice from, but everybody
pays. Pickle is already slow enough now :).

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[Python-Dev] sys.intern should work on bytes