Kotlin doesn't have a notion of union types, so I ...

# announcements

[jonathan]

Kotlin doesn't have a notion of union types, so I imagine it would either smart cast it to the nearest superclass (probably Entity), or not cast it at all.

[Bob Glamm]

sealed class Foo
data class Case1(...) extends Foo
data class Case2(...) extends Foo

just like in Scala. Arrow-KT's Either is implemented similarly