- Support DAGs.
- Add is_leaf, is_parent, is_branch, and is_root.
- Tree::Visitor
- - Come up with a better name for attach_before and attach_after.
+ - Come up with a better name for attach_before and
+ attach_after.
- Support multiple columns for ordering.
- - Declare both the parent column and the position column in one call.
+ - Declare both the parent column and the position column
+ in one call.
+ - Add an ancestors() and descendants() method with
+ support for resultset cacheing.