Fizlet 0.3.5

Fixed

• kernel: the root's IntersectionObserver is disconnected on destroy() and when the parent signal aborts, before or after start(). Its abort listener was tied to the same signal, so the browser removed it before it could run.
• kernel: starting, stopping or destroying engines from inside a hook no longer asks for a second requestAnimationFrame or skips the next engine's frame, and a restarted engine runs once per frame, not twice.
• kernel: engine.remove(system) inside a hook no longer skips the next system's hooks that frame.
• kernel: a hook that throws no longer stops the shared clock for every engine on the page. Only that engine stops (paused: ["stopped"], start() resumes); the error goes to the new onError(error, engine) option, or console.error.
• kernel: destroy() is idempotent and leaves the engine inert: advance, add and start do nothing, and a destroy from inside a step runs no more steps that frame.

Changed

• kernel: options are validated at setup. step must be a finite number > 0, seed finite, maxSteps, events and pool caps positive integers (new EventRing and new Pool too); a bad value throws a RangeError that names it. Kernel size 2839 → 3106 bytes gzip (budget 4096).