A more complete description is available here [0], but the essence of it is that the type of many functions that used to be specifically about lists has become more general, but also arguably harder to understand.<p>[0] <a href="https:&#x2F;&#x2F;wiki.haskell.org&#x2F;Foldable_Traversable_In_Prelude" rel="nofollow">https:&#x2F;&#x2F;wiki.haskell.org&#x2F;Foldable_Traversable_In_Prelude</a>