Function std_dev::percentile::median_of_medians_by

pub fn median_of_medians_by<T: Clone + PercentileResolve>(
    values: &mut [T],
    target: impl OrderedListIndex,
    compare: &impl Fn(&T, &T) -> Ordering
) -> MeanValue<T>

Same as median_of_medians but with a custom comparator function.