Stop loss on the same day the position was opened

Expected Behavior

Strategy closes the position at 720

Actual Behavior

Strategy closes the position on next candle at open price, 705.58

Steps to Reproduce

Run the following code. You can see the wrong behaviour on 2012-10-18

from backtesting import Backtest, Strategy
from backtesting.test import GOOG


class DummyStrategy(Strategy):
    def init(self):
        pass

    def next(self):
        if f"{self.data.index[-1]}" == "2012-10-17 00:00:00":
            self.buy(sl=720)


if __name__ == "__main__":
    data = GOOG.tail(100)
    backtest = Backtest(data, DummyStrategy, cash=10000)
    result = backtest.run()
    backtest.plot()

Additional info

• Backtesting version: 0.2.0

Start by running the Backtest with the provided DummyStrategy, GOOG data, and Backtest.run() entry point to reproduce the 2012-10-18 result. Trace the Strategy.buy(sl=720) execution and verify that a position opened on 2012-10-17 closes at the stop-loss price on the same day; done means the result no longer waits for the next candle at 705.58.