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;

  }

}