[issue17810] Implement PEP 3154 (pickle protocol 4)

[Antoine Pitrou]

Antoine Pitrou added the comment:

> With framing it isn't annoying.

Slightly less, but you still have to wrap readline() calls in the
unpickler.

I have started experimenting with PREFETCH, but making the opcode
optional is a bit annoying in the C pickler, which means it's simpler to
always emit it, which means it's not very different from framing in the
end :-)

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