is_same_period correctness

[powellnorma]

# 5min candles
c1 = OHLCV(time=datetime.fromisoformat('2024-01-02T15:45:00+00:00'), open=1, high=2, low=3, close=4)
c2 = OHLCV(time=datetime.fromisoformat('2024-01-02T15:50:00+00:00'), open=1, high=2, low=3, close=4)

s = Sampler(SamplingPeriodType.MIN_15)
print(s.is_same_period(c1, c2))

I think usually the time of a candle represents the end timestamp of the period (that the candle represents).
In that case c1 would represent 40-45, and c2 45-50. So c1 would belong to the 15min period 30-45, and c2 to 45-60. Yet, currently is_same_period returns True