Module Fpath_extended

Adding a few functions to FPath to use alongside Base.

  let hashtbl = Hashtbl.create (module Fpath_extended) in
  ...
type t = Fpath.t
include Ppx_compare_lib.Comparable.S with type t := t
val compare : t -> t -> int
include Ppx_compare_lib.Equal.S with type t := t
val equal : t -> t -> bool
include Ppx_hash_lib.Hashable.S with type t := t
val hash_fold_t : Base.Hash.state -> t -> Base.Hash.state
val hash : t -> Base.Hash.hash_value
val sexp_of_t : t -> Sexplib0.Sexp.t
val arg_type : t Command.Arg_type.t