Signals force update

[cesarParra]

Currently, signals only evaluate their dependents if a change is detected in the signal value. Something is considered a change if the value is different or, in the case of an object, if the isEqual function deems it different.

There are cases when we want for dependents to reevaluate no matter what, any time that the signal's setter is called. This can be to override the isEqual check, or simply because we want to force trigger a dependent (for example, to rerun an effect, or to update a stale resource by forcing it to go to the DB).

Proposal

Add a force flag to the signal on creation. When on then the signal's setter will bypass the equality check and always notify its dependents that something changed.

$signal(0, {
  force: true
});