Watchable values.
A Watchable exists to keep track of a value which may change over time. It allows
observers to be notified of changes to the value. The aim is to always be aware of the
last value, not to observe every value change.
In that way, a Watchable is like a tokio::sync::broadcast::Sender, except that there's no risk
of the channel filling up, but instead you might miss items.
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