[WithinReason]

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

[aquarin]

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

[aquarin]

Is the "Natural structure" described in some paper?

[tidwall]

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...