measureVacuity

Measure how much the generator actually searched, over the pools of seeds. Asserts nothing.

See VacuityFloors for the exact pair and step definitions — in particular that a pair is an ordered pair of distinct pool positions, which is what makes a total order read 50% ancestry rather than 100%.

O(pool²) joins per seed against the associativity pass's O(pool³), so this is free at any pool size that pass can afford.