`object
method add_hook : ('a -> 'a -> unit) -> unit
method get : 'a
method get_default : 'a
method get_default_formatted : Stdlib.Format.formatter -> unit
method get_formatted : Stdlib.Format.formatter -> unit
method get_help : string
method get_help_formatted : Stdlib.Format.formatter -> unit
method get_name : string list
method get_short_name : string option
method get_spec : Stdlib.Arg.spec
method reset : unit
method set : 'a -> unit
method set_raw : Config_file.Raw.cp -> unit
method set_short_name : string -> unit
end`