== and ===operator.kt

    open class A(open val hoge : String)
    class B(override val hoge : String) : A(hoge)

    fun main(args: Array<String>) {    
    
        val a = "a"
        val b = "a"
        val c = 3
        val d = 3
        val e = A("hoge")
        val f = A("hoge")
        val g = B("hoge")
    
        println(a == b)
        println(a === b)
        println(c == d)
        println(c === d)
        println(e == f)
        println(e === f)
        println(e == e)
        println(e === e)
        println(f == g)
        println(f===g)
}

true
true
true
true
false
false
true
true
false
false