[issue17810] Implement PEP 3154 (pickle protocol 4)

[Antoine Pitrou]

Antoine Pitrou added the comment:

And here is an implementation of PREFETCH over Alexandre's work.
As you can see the code complexity compared to framing is mostly a wash, but I think fixing pickletools.optimize() will be easier with PREFETCH (still needs confirmation, of course :-)).

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Added file: http://bugs.python.org/file30072/prefetch.patch

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