Ordering for Any with the following rules: numerical > string > any other reference type.
Methods common to
Graph companion objects in the core module.
the kind of type of the graph that is to become the companion class/trait of the object extending this trait.
GraphCompanion extended to work with
Iterator facilitating group-wise iteration over two ore more levels.
Simple or composite type of elements being subject to the iteration. For instance, a two-level iteration could expose just the elements of the inner loop or both the outer and the inner loop elements as a tuple.