private val strings = listOf(
    "plip",
    "plap",
    "plop",
)
private val listModel = ListStore<StringObject>().apply {
    strings.forEach {
        append(StringObject(it))
    }
}
private val treeModel = TreeListModel<StringObject>(listModel, false, false) { parent ->
    return@TreeListModel null
}

fun main(args: Array<String>) {
    // runs ok
    val listItem = listModel.getItem(0)
    println("list item #0: $listItem")

    // crashes at runtime with a class cast exception:
    //  compile-time type is StringObject, runtime type is TreeListRow
    val treeItem = treeModel.getItem(0)
    println("tree item #0: $treeItem")
}