Queues setting a new value for the signal to the next microtask.
If the new value is different from the current value (based on the equality function),
all registered dependents will be notified of the new value.
Queues updating the signal's value based on its current value to the next microtask.
If the new value is different from the current value (based on the equality function),
all registered dependents will be notified of the new value.
Describes a signal that can be written to.