<p>Ah, nice catch with the unused members.  There is certainly a lot of interesting open work here; when I have some free research time I think I will devote it towards enumerating all the different types of bounds that could be used for dual-tree nearest neighbor search (or even single-tree search possibly?) and revamp the code.  Open a PR for the two commits you made, and I'll merge it in.  Thanks again for all the time you've put towards this. <g-emoji alias="+1" fallback-src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f44d.png">👍</g-emoji> </p>

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