>I haven't been able to think of how it would preclude using the index,
>but I suspect it's more a matter of needing a similar-but-different
>codepath to optimize for the NOT case, rather than a simple "invert
>this" codepath relying on the existing case.  Which is really just
>another way of stating Jay's point, perhaps.

I understand.  Perhaps I'm biaised by using functional languages where 
such operators as NOT in our case are applied as deep as possible in 
the process of any evaluation.



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