[issue13735] The protocol > 0 of cPickle does not given stable dictionary values

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Ah, right. BINPUT is used to memoize objects in case a restructive structure happens. You can use pickletools.optimize() to remove the useless BINPUTs out of a pickle stream.

Note that 3.x is more consistent and always emits the BINPUTs. It seems 2.x's cPickle (which is really a weird piece of code) may do some premature optimization here.

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