* Unbinds event handlers for either all of a [Player]'s gossip events, or one type of event. * * If `event_type` is `nil`, all the [Player]'s gossip event handlers are cleared. * * Otherwise, only event handlers for `event_type` are cleared. * * @proto (entry) * @proto (entry, event_type) * @param uint32 entry : the low GUID of a [Player] whose handlers will
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