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Accepted, and back to Neil for checkin.  I don't think you 
need to go thru Guido again, as you and I both talked with 
him about the issues, and you've addressed them.  Feel free 
to reassign to Fred if you want better doc review, though.

I don't know what to make of someone "thinking" a speed 
increase is measurable:  you either measured one, or you 
didn't <wink>.  My intuition is that the macros are a good 
idea, although if they're not to be used by extension 
modules then their names should begin with an underscore 
(to make clear that they're not part of the public API).