code: private function writeBoolErr($row, $col, $value, $isError, $xfIndex)
      {
          $record = 0x0205;
          $length = 8;
  
          $header = pack('vv', $record, $length);
          $data = pack('vvvCC', $row, $col, $xfIndex, $value, $isError);
          $this->append($header . $data);
  
          return 0;
      }
docs: Write a boolean or an error type to the specified row and column (zero indexed).
  
  @param int $row Row index (0-based)
  @param int $col Column index (0-based)
  @param int $value
  @param bool $isError Error or Boolean?
  @param int $xfIndex
  
  @return int