* Unbinds event handlers for either all [Guild] events, or one type of [Guild] event. * * If `event_type` is `nil`, all [Guild] event handlers are cleared. * * Otherwise, only event handlers for `event_type` are cleared. * * @proto () * @proto (event_type) * @param uint32 event_type : the event whose handlers will be cleared, see [Global:RegisterGuildEvent]
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