* Unbinds event handlers for either all [Player] events, or one type of [Player] event. * * If `event_type` is `nil`, all [Player] 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:RegisterPlayerEve
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