using newtype for MutableFdCache for cleaner API.
using newtype for MutableFdCache for cleaner API.

kazu-yamamoto/wai,frontrowed/wai,sordina/wai,erikd/wai,creichert/wai,frontrowed/wai,frontrowed/wai,creichert/wai,erikd/wai,tolysz/wai,erikd/wai,sordina/wai,utdemir/wai,tolysz/wai,sordina/wai,utdemir/wai,utdemir/wai,tolysz/wai,sordina/wai,yesodweb/wai,utdemir/wai,kazu-yamamoto/wai,frontrowed/wai,yesodweb/wai,tolysz/wai,erikd/wai