It&#x27;s been there for a while, although not intensely advertised: <a href="https:&#x2F;&#x2F;hackage.haskell.org&#x2F;package&#x2F;base-4.8.1.0&#x2F;docs&#x2F;Numeric-Natural.html" rel="nofollow">https:&#x2F;&#x2F;hackage.haskell.org&#x2F;package&#x2F;base-4.8.1.0&#x2F;docs&#x2F;Numeri...</a>