code: func RegisterTwoOfFive(pdf barcodePdf, code string, interleaved bool) string {
  	bcode, err := twooffive.Encode(code, interleaved)
  	return registerBarcode(pdf, bcode, err)
  }
docs: // RegisterTwoOfFive registers a barcode of type TwoOfFive to the PDF, but not
  // to the page. Use Barcode() with the return value to put the barcode on the
  // page.
  //
  // The interleaved bool is inherited from twooffive.Encode().