> You've merely replaced the 'test n<0' with 'not check' at the expense
> of an additional parameter that has to be passed each time (and the
> additional test 'n<0' for the first iteration).
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>
I think you have missed the point. The OP stated that n<0 could stand
for an expensive
operation, this replaces an expensive check every time with a cheaper
one every time.

I like the idea of the interface that was in the original post.

Cheers,
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