val a: Int = 100
    val boxedA: Int? = a
    val anotherBoxedA: Int? = a
    
    val b: Int = 10000
    val boxedB: Int? = b
    val anotherBoxedB: Int? = b
    
    println(boxedA === anotherBoxedA) // true
    println(boxedB === anotherBoxedB) // false