OptionalreleasesDispose releases a caller awaiting start even though its inner work never settles.
OptionalresetsThe subject has a LifecycleSubject.reset: emit the "reset mid-flight" case.
OptionalusableWhy a call after dispose is not a no-op (the owner deliberately stays usable).
OptionalflushLet pending callbacks run. Default: a burst of microtasks (safe under fake timers).
For each case:
trueto run it, or why it does not apply.