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Sometimes it's useful to know if any handlers have been attached to an event. For instance, when performing schema validation using XmlReader, if there are no listeners an exception is thrown. If the delegate variables used by the Event types were somehow exposed, we could check either if they're null or if GetInvocationList() returns an empty array.
Since exposing the delegate might be undesirable, it might be sufficient to have something like the following on Event:
member x.Handled = (multicast <> null)