For various reasons, we store the dispatch list for an object on a separate property of an `EventDispatcher` rather than dictating that all children of `EventDispatcher` use a specific object type. This is because `EventDispatcher` is a very general class with lots of object representations it needs to cover. So instead, we introduce a new object representation for a *property* and store it in a Ruffle private namespace that is as isolated from user code as alternate object representations are.
David Wendt