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Okay, I just want to double-check these two points:

1.  You did look at the actual resulting source code and not
just the patch, right?  Here's a side-by-side:
http://zooko.com/temp.html

2.  You realize that my promise that the actual speedup is <
5% is in a realistic application-level benchmark.  For
microbenchmarks, the speed-up is various but generally much
higher than 5%, as described in this patch tracker entry.

Given these two facts, then please reject this patch and
spend your time on the new cached attribute lookups
architecture instead.  ;-)

Regards,

Zooko