y 'Traversable' container. This is an 'IndexedTraversal' that is indexed by ordinal position.
traversed :: Traversable f => IndexedTraversal Int (f a) (f b) a b
traversed = indexing traverse
{-# INLINE trav
traversed :: Traversable f => IndexedTraversal Int (f a) (f b) a b
traversed = indexing traverse
traversed = indexing traverse