def METHOD_NAME(
    forecast: QuantileForecast, quantile_levels: List[float]
):
    sorted_levels = sorted(quantile_levels)
    quantile = forecast.quantile(sorted_levels[0])
    if np.isnan(quantile).any():
        return False
    for level in sorted_levels[1:]:
        prev_quantile = quantile
        quantile = forecast.quantile(level)
        if (quantile < prev_quantile).any():
            return False
    return True