yes, you are correct. Since I posted the above, I too figured all manner of cases when my assumption wouldn't work. Shucks, and thanks for confirming.
--

when small people start casting long shadows, it is time to go to bed

In reply to Re^4: Speeding up point-in-polygon -- take two by punkish
in thread Speeding up point-in-polygon -- take two by punkish

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