[issue15642] Integrate pickle protocol version 4 GSoC work by Stefan Mihaila

[Stefan Mihaila]

Stefan Mihaila added the comment:

Are there also some known techniques on tracking down memory leaks?

I've played around with sys.gettotalrefcount to narrow down
the place where the leaks occur, but they seem to only occur in v4,
i.e. pickle.dumps(3.0+1j, 4) leaks but pickle.dumps(3.0+1j, 3) does
not.
However, there appears to be no difference in the code that gets
executed in v3 to the one executed in v4.

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