docs: @Override
    public Cell getCell(int cellnum, MissingCellPolicy policy) {
      StreamingCell cell = (StreamingCell) cellMap.get(cellnum);
      if(policy == MissingCellPolicy.CREATE_NULL_AS_BLANK) {
        if(cell == null) { return new StreamingCell(cellnum, rowIndex, false); }
      } else if(policy == MissingCellPolicy.RETURN_BLANK_AS_NULL) {
        if(cell == null || cell.getCellTypeEnum() == CellType.BLANK) { return null; }
      }
      return cell;
    }