Reid Kleckner <r...@mit.edu> added the comment:

I have an patch for unladen-swallow out for review here:
http://codereview.appspot.com/160063/show

It resolves the correctness issues I mentioned previously by emitting guards if 
necessary.  If the type is predictable and uses slots, then we don't need to 
check the instance dict.

It gives a 5% speedup on the unpickle benchmark.  Presumably the other 
benchmarks do not do as many method calls.

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<http://bugs.python.org/issue6033>
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