Correct null assigner instead of or assignment
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				@ -13,7 +13,7 @@ class EventHandler {
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	}
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						}
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	on(event, listener) {
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						on(event, listener) {
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		this.events[event] ||= { name: name, listeners: [], callCount: 0 }
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							this.events[event] ??= { name: name, listeners: [], callCount: 0 }
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		this.events[event].listeners.push(listener)
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							this.events[event].listeners.push(listener)
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	}
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						}
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