*
* @param <T> Value type of Leaf entries
*/
-public interface UserLeafSetNode<T> extends LeafSetNode<T>, OrderedNodeContainer<LeafSetEntryNode<T>> {
+public non-sealed interface UserLeafSetNode<T> extends LeafSetNode<T>, OrderedNodeContainer<LeafSetEntryNode<T>> {
@Override
@SuppressWarnings("rawtypes")
default Class<UserLeafSetNode> contract() {