Antoine Pitrou added the comment:

> Here is a patch for 3.x. It unify behavior of Python and C
> implementations and unify behavior on 32- and 64-bit platforms.  For 
> backward compatibility Pickler can pickle up to 2G data, but Unpickler 
> can unpickle up to 4G on 64-bit.

I agree the right tradeoff is not easy to find, but I don't think we should 
introduce a regression in _pickle.c just for the sake of making it more 
consistent with's bugs. So _pickle.c behaviour should probably be 
preserved, and should be improved to accept unpickling 4G pickles.


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