[issue17810] Implement PEP 3154 (pickle protocol 4)

[Antoine Pitrou]

Antoine Pitrou added the comment:

Here is a framing patch on top of Alexandre's work.

There is one thing that framing breaks: pickletools.optimize(). I think it would be non-trivial to fix it. Perhaps the PREFETCH opcode is a better idea for this.

Alexandre, I don't understand why you removed STACK_GLOBAL. GLOBAL is a PITA that we should not use in protocol 4 anymore, so we need either STACK_GLOBAL or some kind of BINGLOBAL.

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Added file: http://bugs.python.org/file30068/framing.patch

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