docs: String unformattedContents() {
      switch(currentCell.getType()) {
        case "s":           //string stored in shared table
          if (!lastContents.isEmpty()) {
              int idx = Integer.parseInt(lastContents);
              return new XSSFRichTextString(sst.getEntryAt(idx)).toString();
          }
          return lastContents;
        case "inlineStr":   //inline string (not in sst)
          return new XSSFRichTextString(lastContents).toString();
        default:
          return lastContents;
      }
    }