Macro dynamic_score_set 

macro_rules! dynamic_score_set {
    () => { ... };
    ($($weight:expr => $metric:expr),+ $(,)?) => { ... };
}

Declare a dynamic set of weight => metric pairs (Layer 3).

Metrics are auto-boxed via .boxed() — no manual boxing needed. Weights are normalized and a DynamicScoreSet is returned.

Example

let gc  = metric("gc") .measure().by(...).map01().by(...);
let len = metric("len").measure().by(...).map01().by(...);

let set = dynamic_score_set! {
    2.0 => gc,
    3.0 => len,
}?;

let total = set.sum(&input);