module Transform: sig .. end
val string_to_item : ?more_columns:Biocaml_bed.parsing_spec ->
       unit ->
       (string,
        (string * int * int * Biocaml_table.Row.item array,
         [> Biocaml_bed.Error.parsing ])
        Core.Result.t)
       Biocaml_transform.t
Create a Biocaml_transform.t-based parser, while providing the
     format of the additional columns (default `strings).
val item_to_string : unit -> (Biocaml_bed.item, string) Biocaml_transform.t
Create a Biocaml_transform.t which “prints” BED data
     (reminder: includes ends-of-line).