Oh, sorry, made one more attemp and now I see your algorithm differently.

So you propose to use oE and oV as a markers of borders for what I call Realm.
But there may be very little significant bits in one of this ranges.
pg_sphere and PostGiS extensions tried to use 1 as a marker, with
alike formula. And that generated not a good tree.
Here's how they done it

I'll try to compose a patch for your formula later, I think we should
just try and see, it is easier than to reason about digital floating

Best regards, Andrey Borodin, Octonica & Ural Federal University.

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