public Node<K, V> last() {
      Node<K, V> node = this;
      Node<K, V> child = node.right;
      while (child != null) {
        node = child;
        child = node.right;
      }
      return node;
    }
Returns the last node in this subtree.
lottie/src/main/java/com/airbnb/lottie/parser/moshi/LinkedHashTreeMap.java