For a quick answer check out <a href="https:&#x2F;&#x2F;www.janestreet.com&#x2F;technology&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.janestreet.com&#x2F;technology&#x2F;</a> , &quot;The OCaml difference&quot; near the end of the page.