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Description
Steven Johnson mentioned that you can just assign a geometry to both sides of a partitioning plane in this Discourse post. We should implement that, if not in SpatialTreeInterface or another util package like NaturalIndexing, then in an external package that satisfies SpatialTreeInterface.
It would just be a cool thing to do and benchmark, pretty low priority, but if we wanted to see how kd trees perform against e.g strtrees or natural indexing, this could be a way.