OptionalrunStep?: <T>(step: () => T) => Promise<T>Optional owner-thread preparation hook; disk writes use the CPU worker.
A completed response is ineligible immediately, before queued unlink.
Takes ownership even when a completed/superseded attempt declines it.
Actual sampler seed, including a server-generated default. Required to continue the random stream exactly after a restart.
True when seed was part of the client request rather than generated
by the server.
Request cancellation/disposal preserves queued and durable state.
One coordinator per checkpoint store. Queue owns snapshots through disk completion; per-key attempts order cleanup before subsequent writes.