Class type NumberFormat.format_part

method _type : Js_of_ocaml.Js.js_string Js_of_ocaml.Js.t Js_of_ocaml.Js.readonly_prop
method _value : Js_of_ocaml.Js.js_string Js_of_ocaml.Js.t Js_of_ocaml.Js.readonly_prop