* Unbinds event handlers for either all of an instanced [Map]'s events, or one type of event. * * If `event_type` is `nil`, all the instanced [Map]'s event handlers are cleared. * * Otherwise, only event handlers for `event_type` are cleared. * * @proto (instance_id) * @proto (instance_id, event_type) * @param uint32 entry : the ID of an instance of a [Map]
source not stored for this graph (policy: none)