undergroundwires 7ab16ecccb Refactor watch sources for reliability ...

This commit changes `WatchSource` signatures into `Readonly<Ref>`s.

It provides two important benefits:

1. Eliminates the possibility of `undefined` states, that's result of
   using `WatchSource`s. This previously required additional null checks.
   By using `Readonly<Ref>`, the state handling becomes simpler and less
   susceptible to null errors.
2. Optimizes performance by using references:
   - Avoids the reactive layer of `computed` references when not needed.
   - The `watch` syntax, such as `watch(() => ref.value)`, can introduce
     side effects. For example, it does not account for `triggerRef` in
     scenarios where the value remains unchanged, preventing the watcher
     from running (vuejs/core#9579).

2023-11-11 13:55:21 +01:00

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