Ask a question about swift, about array type conversion, thank you！ :     class Model: NSObject {
        var numbers : Array<Int> = []
    }
    
    internal func test() {
        let model : Model = Model.init()
        model.setValue([1,2,3], forKey: "numbers")
        print(model.numbers)
    }
    
    test()//[1, 2, 3]

But if I change the above "var numbers : [Int] = []" to "var numbers :[Int64] = []", it will crash. Why is that? How can I solve it?
