ReadonlycellsReadonlyendReadonlyengineReadonlyflagsReadonlyhouseThe requested house system.
ReadonlylatitudeReadonlylongitudeReadonlyroundingReadonlyschemaReadonlystartReadonlyswitchesSwitches in time order, one per cell boundary.
ReadonlyunresolvedIntervals left unresolved, in time order; empty unless node-unresolved is flagged.
ReadonlyverificationHow far the switch instants have been checked: dense one-second sampling, not proof.
Cells in time order; they tile [start, end).