Kotlin data class inheritance

Test.kt

interface AbstractDTO {
    val id: Int
}

interface AbstractPayment : AbstractDTO {
    val amount: Int

    fun something(): Int {
        return amount + id
    }
}

data class InternaltionalPayment(override val id: Int, override val amount: Int) : AbstractPayment

fun main(args: Array<String>) {
    val dto = InternaltionalPayment(1, 10)
    val same = InternaltionalPayment(1, 10)
    val other = InternaltionalPayment(2, 12)

    println(dto.something())
    println(same.something())
    println(other.something())
    println("--------------")
    println(dto.hashCode())
    println(same.hashCode())
    println(other.hashCode())
    println("--------------")
    println(dto == same)
    println(dto == other)
    println(same == other)
//11
//11
//14
//--------------
//41
//41
//74
//--------------
//true
//false
//false
}