* A mutable tree node. This is a transient view materialized from a pre-existing node. Modifications are isolated. Once
* this object is {@link #seal()}ed, any interactions with it will result in undefined behavior.
*/
-// FIXME: 4.0.0: Use @NonNullByDefault
public interface MutableTreeNode extends StoreTreeNode<TreeNode> {
/**
* Set the data component of the node.