Generic event denoting that the state of an {@link IObservable} object isabout to change. Note that this event is only fired when an observable becomes stale, not when it becomes unstale; an observable that becomes unstale should always fire a change event. Staleness can be used (for example) to notify listeners when an observable has started a background thread for updating its state. Clients can safely ignore staleness.
@see IObservable#isStale()
@since 1.0
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