persistable srecord noeq PriceDigitizer2(PriceCells cells) {
  settable int cellNumber = Int.MIN_VALUE;
  settable int lastCellNumber = Int.MIN_VALUE;
  settable bool verbose;
  settable new UpDownSequence upDownSequence;
  
  // returns new digitized price
  double digitize(double price) {
    double cn = cells.toCellNumber(price);
    if (cellNumber == Int.MIN_VALUE) {
      cellNumber = lastCellNumber = iround(cn);
    } else {
      lastCellNumber = cellNumber;
      cellNumber = iroundTowardsWithOutwardEpsilon(cn, cellNumber, epsilon());
      
      // TODO: assuming there are only 1-steps
      if (cellNumber > lastCellNumber)
        upDownSequence?.addUp();
      else if (cellNumber < lastCellNumber)
        upDownSequence?.addDown();
    }
    ret digitizedPrice();
  }
  
  double epsilon() { ret 1e-4; }
  
  double digitizedPrice() { ret cells.fromCellNumber(cellNumber); }
  double lastDigitizedPrice() { ret cells.fromCellNumber(lastCellNumber); }
  
  // digitize price without looking at history
  double digitizeIndividually(double price) {
    double cn = cells.toCellNumber(price);
    ret cells.fromCellNumber(round(cn));
  }
  
  PriceCells priceCells() { ret cells; }
  
  // brave
  void swapPriceCells(PriceCells newPriceCells) {
    cells = newPriceCells;
  }
}