public TreeNode<T> attach(final T child) {
		return attach(TreeNode.of(child));
	}
Attaches the given {@code child} to {@code this} node.

@param child the child to attach to {@code this} node
@return {@code this} tree-node, for method chaining
jenetics.ext/src/main/java/io/jenetics/ext/util/TreeNode.java