Collator.t
method compare : (Js_of_ocaml__Js.js_string Js_of_ocaml__Js.t -> Js_of_ocaml__Js.js_string Js_of_ocaml__Js.t -> int) Js_of_ocaml__Js.readonly_prop
method resolvedOptions : unit -> resolved_options Js_of_ocaml__Js.t Js_of_ocaml__Js.meth