sclass TradingRun extends TradingCandle {
  new L<TradingCandle> candles;
  
  void add aka addCandle(TradingCandle candle) {
    addValue(candle.end, candle.endTime);
  }
  
  int size() { ret l(candles); }
  
  S myType() { ret "run length " + n2(candles); }
}