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It appears that `-[NSObject performSelector:]` returns a dummy value when calling a void method on the iOS Simulator, whereas it correctly returns `nil` on a device. Since `-[NSObject performSelector:]` is declared as returning `id`, the iOS runtime tries to marshal the dummy value to a JavaScript object and fails because the dummy value is not a valid Objective-C object. The fix is to use `-[NSObject valueForKey:]` for non-void zero-parameter methods and `NSInvocation` for everything else.