Tree node object (not intended for public use)
make System.collections._TreeNode(k, v, p): Class constructor.item: Node's value.key: Node's key.left: Nodes lower than current.parent: Node's parent.right: Nodes greater than current.count(): Return number of nodes in the tree.find_leftmost(): Find leftmost node in tree.find_rightmost(): Find rightmost node in tree.get(k): Grab value of specified node.remove(k): Remove given key from tree.set(k, v): Set key to specified value.