/**
* {@link IObservableValue} implementation that wraps an
* {@link IObservableValue} and delays notification of value change events from
* the wrapped observable value until a certain time has passed since the last
* change event. This class helps to boost performance in bindings (both in
* validation and in event firing) when the observed value is rapidly changing.
* A common use of this class is to delay validation until the user stops typing
* in an UI field. To notify about pending changes, a DelayedObservableValue
* fires a stale event when the wrapped observable value fires a change event,
* and remains stale as long as a value change is pending.
*
* Note that this class will not forward {@link ValueChangingEvent} events from
* a wrapped {@link IVetoableValue}.
*
* @since 1.2
*/
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