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                                            vacuus

Swap out num_cpus for std::thread::available_parallelism

I don't know how important this is for Bevy, but `std::thread::available_parallelism` is erroneous for "environments where the available parallelism is controlled by cgroupv1" (https://github.com/rust-lang/rust/pull/97911), leading to significantly higher memory usage...

Need the OnEnter() and OnExit() to be run even if when transitioning to and from the same state.

Add `OnEachEnter` and `OnEachExit` schedules?

Need the OnEnter() and OnExit() to be run even if when transitioning to and from the same state.

There are use cases for both re-triggering and not re-triggering. See https://github.com/bevyengine/bevy/issues/8191. I don't know what the overhead of a schedule is in Bevy, but if it's not significant then...

Idea: how to eliminate / avoid `Option::unwrap` calls

Your first example could use `.count()` and avoid the `Vec` altogether.