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Hi Jack,

I finally got around to reimplementing the functionality of 
the patch given your suggestions. I think it should be 
fairly bulletproof. Due to circular imports I ended up 
having to do more work in the package's __init__.py. 
The upshot of flattening the lookup dicts is that it gets 
done once, and then after that name lookups are 
lightning fast. In our production environment the 
speedup was impressive :-) Thanks for the 
suggestions.

Donovan