* Unbinds event handlers for either all of a [GameObject]'s events, or one type of event. * * If `event_type` is `nil`, all the [GameObject]'s event handlers are cleared. * * Otherwise, only event handlers for `event_type` are cleared. * * **NOTE:** this will affect all instances of the [GameObject], not just one. * To bind and unbind events to a single [GameObje
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