When the world ticks: once per animation frame, { kind: "frame" }, the default, or every step milliseconds,
{ kind: "fixed", step }. Under fixed, a beat that's behind runs at most maxSteps ticks, 4 by default, and drops
the rest of the debt; each tick's clock.delta is step.
When the world ticks: once per animation frame,
{ kind: "frame" }, the default, or everystepmilliseconds,{ kind: "fixed", step }. Underfixed, a beat that's behind runs at mostmaxStepsticks, 4 by default, and drops the rest of the debt; each tick'sclock.deltaisstep.