Function compare 

pub fn compare<P: EffectProvider + ?Sized>(
    a: &CollectedHandler<P>,
    b: &CollectedHandler<P>,
) -> Ordering

The exact Showdown comparePriority lexical order (design §1.3): order → priority → speed → sub_order → effect_order.

order/sub_order/effect_order are ascending (LOW first); priority/speed are descending (HIGH first).