Is there a way to lock down a sealed class to prev...

# getting-started

[rellenberger]

Is there a way to lock down a sealed class to prevent extensions on it?

[Ruckus]

You can't lock out extensions any more than you can lock out using the class as a parameter, because that's what it gets compiled down to.

fun SealedClass.doStuff() {
    ...
}

becomes

static void doStuff(SealedClass $receiver) {
    ...
}