Manager object for synthetic event subscriptions to aggregate multiple synths on the same node without colliding with actual DOM subscription entries in the global map of DOM subscriptions. Also facilitates proper cleanup on page unload.
Removes the subscription from the Notifier registry.
Used by the event system's unload cleanup process. When navigating away from the page, the event system iterates the global map of element subscriptions and detaches everything using detachAll(). Normally, the map is populated with custom events, so this object needs to at least support the detachAll method to duck type its way to cleanliness.
Adds a subscription from the Notifier registry.