[IronPython] Pickle bug

[Michael Foord]

Pickle on IronPython doesn't preserve sufficient information to unpickle 
floats accurately:

CPython:
 >>> a = 1 /3.0
 >>> import cPickle as pickle
 >>> pickle.loads(pickle.dumps(a)) == a

IronPython:
 >>> import cPickle as pickle
 >>> a = 1 /3.0
 >>> pickle.loads(pickle.dumps(a)) == a
False

This is actually causing us numerical errors in Resolver One. CPython is 
actually very careful about its string representation of floats so that 
this is possible.

Michael

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