Here we're exploring API suggestions that might be handy or help with handling README#precautions:

1. Expression with explicit dependencies by @voliva :

const a = timer(0, 1000);
const b = timer(0, 1000);
const c = computed((a, b) => a + b,  a, untrack(b)))

This will react to every change and is side-effect safe
It's basically a combineLatest + withLatestFrom + map — most honest way to react to every Observable emission

2. Async/await syntax:

const a = timer(0, 1000);
const b = timer(0, 1000);
const c = computed(async () => await $(a) + await $(b))

It might react to every change, and is side-effect safe

3. Provide initial value via tracker by @loreanvictor

Trackers might with initial value (default value?)

const a = interval(1000);
const b = timer(500);
const c = computed(() => $(a, 42) + _(b, 'hi!'));
// > 42 hi!
// > 0 0
// > 1 0
// > …

4. String tag tracker by @voliva & @loreanvictor:

const a = timer(0, 1000);
const b = tagger`${ a } 🦔`;
// > 0 🦔
// > 1 🦔
// > ...

Alternatives:

1. we can have tagger to be equivalent of a tracker with concatenation

2. string expression might be evaluated

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Suggested APIs can co-exist with the original one, available via different names.

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If you have an idea — please, add a comment describing it.