AsapScheduler can interrupt random intervals

[garrisig]

Describe the bug

An interval scheduled somewhere else (including rxjs timer) can be unduly canceled by AsapScheduler implementation:

1. Create a timer with timer(0, intervalDuration, asapScheduler), with intervalDuration > 0
2. The timer method calls scheduler.schedule(callback, 0) (https://github.com/ReactiveX/rxjs/blob/7.8.2/src/internal/observable/timer.ts#L170C12-L170C30)
3. The asapScheduler generates an ID from Immediate, we can call it immediateId (https://github.com/ReactiveX/rxjs/blob/7.8.2/src/internal/util/Immediate.ts#L24)
4. The callback reschedules itself calling schedule(undefined, intervalDuration)
5. In https://github.com/ReactiveX/rxjs/blob/7.8.2/src/internal/scheduler/AsyncAction.ts#L52, this.id != null, so this.recycleAsyncId(scheduler, id, delay) is called with the id = immediateId and non-zero delay.
6. asapAction falls back to ayncAction implementation of recycleAsyncId because delay is non-zero (https://github.com/ReactiveX/rxjs/blob/7.8.2/src/internal/scheduler/AsapAction.ts#L30)
7. asynAction.recycleAsyncId unduly clears an interval with id = immediateId https://github.com/ReactiveX/rxjs/blob/7.8.2/src/internal/scheduler/AsyncAction.ts#L79

Expected behavior

The AsapScheduler should be protected in order not to affect unrelated code.

The AsyncScheduler could be protected as well by using the type-system to ensure that only ids generated by setInterval are passed to clearInterval

Reproduction code

import { asapScheduler, timer } from 'rxjs';

let n = 0;

const a = setInterval(() => console.log(n++), 200);

console.log(`interval id: ${a}`);
setTimeout(() => {
  timer(0, 10000, asapScheduler).subscribe(() => console.log("I did not eat the other interval"));
}, 1);

setTimeout(() => {
  timer(0, 10000, asapScheduler).subscribe(() => console.log("I did not eat the other interval"));
}, 2);

setTimeout(() => {
  timer(0, 10000, asapScheduler).subscribe(() => console.log("I ate the other interval"));
}, 3);

Reproduction URL

No response

Version

<= 7.8.2

Environment

Any environment. Happens at least in

• Firefox 147
• Chromium 145
• Node version v22.20.0

The reproduction code was tested in Node 22.20.0

Additional context

No response

[garrisig]

Probably related/same bug: #7205