{@link BitVector} range with a power of 2 length, where the inclusive start hasall the {@code level} lowest bits set to zero, and the lowest {@code level}bits of the inclusive end are all set to one. A single point is represented as a bit set with {@code level=0}.
Caveat: As soon as the underlying bit set is modified, an instance and all its clones should be considered invalid. We have to make this compromise for performance reasons.
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