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

[Alexandre Vassalotti]

Alexandre Vassalotti added the comment:

Some quick thoughts about the new implicit memoization scheme in Stefan's implementation. 

- The new scheme will need to be documented in PEP 3154 before we can accept the change.
- I don't really like the idea of changing the semantics of the PUT and GET opcodes. I would prefer new opcodes if possible.
- I would like to see benchmarks for this change.

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