Function std_dev::percentile::cluster::percentile_default_pivot_by

pub fn percentile_default_pivot_by(
    values: &mut OwnedClusterList,
    target: impl OrderedListIndex,
    compare: &mut impl FnMut(f64, f64) -> Ordering
) -> MeanValue<f64>

Same as percentile_default_pivot but with a custom comparator function.