> > But not sure how much extra overhead or difficulty that would cause for > other projects consuming such a new type. >
It would be the same difficulty/overhead as creating a GeometryCollection instead of passing around an array of geometries or creating an Envelope instead of working with arrays of four doubles. In other words, negligible. We're just saying "this isn't a random array of polygons, it's a set that has some special properties." Dan
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