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…andas Series) per candle
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Resolves #1300
Enhancement description
This PR removes the strict requirement that
spreadmust be a static float. It modifiesBacktest.__init__and_Brokerso thatspreadcan be passed as a sequence (like a Pandas Series or Numpy Array) that matches the length of the dataframe.This enables variable spreads per candle, which is much more realistic for backtesting through high-volatility events like NFP or earnings.