`sig
val progress : bool Stdlib.ref
val progress_line : string -> unit
val progress_line_no_end : string -> unit
val progress_page : int -> unit
val progress_endpage : unit -> unit
val progress_done : unit -> unit
val remove_dict_entry : Pdf.t -> string -> Pdf.pdfobject option -> unit
val replace_dict_entry :
Pdf.t -> string -> Pdf.pdfobject -> Pdf.pdfobject option -> unit
val check_injectible : string -> unit
end`