Optional ReadonlyatomicReadonlybatchBatch admission may finish a short last drain and token zero in one tick. Otherwise execution yields between every drain and the next forward.
ReadonlyendReadonlykindOptional ReadonlymaintainSome methods maintain their final target chunk before sampling.
ReadonlyphaseReadonlysnapshotReadonlystart
A non-causal input cannot be split at a scheduler token budget. Its preparation must decline joins until this step completes.