docs: def writexlsx(self, path, sheetname="default"):
          """
          Writes this table to an .xlsx file at the specified path.
  
          If you'd like to specify a sheetname, you may do so.
  
          If you'd like to write one workbook with different DataTables
          for each sheet, import the `excel` function from acrylic. You
          can see that code in `utils.py`.
  
          Note that the outgoing file is an .xlsx file, so it'd make sense to
          name that way.
          """
          writer = ExcelRW.UnicodeWriter(path)
          writer.set_active_sheet(sheetname)
          writer.writerow(self.fields)
          writer.writerows(self)
          writer.save()