[Python-ideas] Make __reduce__ to correspond to __getnewargs_ex__

[Neil Girdhar]

Currently __reduce__<http://docs.python.org/3.4/library/pickle.html#object.__reduce__>returns up to five things:

(1) self.__new__ (or a substitute)
(2) the result of __getnewargs__<http://docs.python.org/3.4/library/pickle.html#object.__getnewargs__>, 
which returns a tuple of positional arguments for __new__<http://docs.python.org/3.4/reference/datamodel.html#object.__new__>
,
(3) the result of __getstate__<http://docs.python.org/3.4/library/pickle.html#object.__getstate__>, 
which returns an object to be passed to __setstate__<http://docs.python.org/3.4/library/pickle.html#object.__setstate__>
(4) an iterator of values for appending to a sequence
(5) an iterator of key-value pairs for setting on a string.

Python 3.4 added the very useful (for me) __getnewargs_ex__<http://docs.python.org/3.4/library/pickle.html#object.__getnewargs_ex__>, 
which returns a pair:
(1) a tuple of positional arguments for __new__<http://docs.python.org/3.4/reference/datamodel.html#object.__new__>
(2) a dict of keyword arguments for __new__<http://docs.python.org/3.4/reference/datamodel.html#object.__new__>

Therefore, I am proposing that __reduce__ return somehow these keyword 
arguments for __new__.

Best,
Neil
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