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It implements x==y, but it's also true when one of them is a NaN

I understand. You want to work with NaN-s for some reason.

Is the "Natural structure" described in some paper?

It’s a new structure I came up with as described in the docs/POLYGON_INDEXING.md document. https://github.com/tidwall/tg/blob/main/docs/POLYGON_INDEXIN...