[issue9410] Add Unladen Swallow's optimizations to Python 3's pickle.

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

The patch doesn't apply cleanly anymore. Furthermore, I discovered some additional issues:
- load, dump, loads and dumps from the _pickle module were never used because they were shadowed by the same functions in pickle.py
- once the C functions above are enabled, they produce some bugs

I'm working on an updated patch, fixing the aforementioned bugs and adding a buffer size limit.

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<http://bugs.python.org/issue9410>
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