pub trait NumericReductionFunc: Iterator<Item = f64> {
// Provided method
fn aggregate_by(&mut self, fun: ReductionFunc) -> Option<Self::Item> { ... }
}
pub trait NumericReductionFunc: Iterator<Item = f64> {
// Provided method
fn aggregate_by(&mut self, fun: ReductionFunc) -> Option<Self::Item> { ... }
}