it's possible to make circular loops with effects

[chase-moskal]

despite the tracker having some anti-circularity measures going on, it's still possible to form a simple loop with signals and effects.

i was exploring some ideas with async effects and shenanigans in the exp branch, but more research is needed. i wonder if all effects need to be async so no promises can be dropped, and thus await $signal.set(5) really can reach all possible downstream effect chains...? or maybe the opposite and there should be no async in the system at all, no debouncing, everything is done synchronously? that would make loop detection straightforward... more research is needed...

[chase-moskal]

maybe for 0.4

• core of new tracker is sync (no debouncing)
• this means $a(5) is sync and instantly triggers all subscribers
• maybe debouncing can be done with a await batch(() => { $a(1); $a(2); }) call
• effect responders can be async
• new await settle(() => $a(5)) allows you to await all downstream effect responders