MutableSet don't prevent duplicated content when using sealed class

Support
1

If I use MutableSet with sealed class, the MutableSet accept all duplicated content.

Sample:

sealed class LoginSavedCommand {
    class Login(val email: String, val password: String) : LoginSavedCommand()
    class SaveData(val email: String, val password: String) : LoginSavedCommand()
}

fun main(args: Array<String>) {

    val mSet: MutableSet<LoginSavedCommand> = hashSetOf()

    mSet.add(LoginSavedCommand.Login("oba", "pass"))
    mSet.add(LoginSavedCommand.Login("faiii", "blabla"))

    if (mSet.add(LoginSavedCommand.Login("oba", "pass"))) {
        println("don't")
    } else {
        println("do")
    }
}

I passed the same values to LoginSavedCommand.Login, but the MutableSet keep accepting add the same value (on the sample println print “don’t”, and I need to print “do”, because I can prevent duplicated content using this selaed class)

2

Solved on stackoverflow: