Type Alias KeepDropSpec

One entry inside a flattened keep/drop chain. Counts are resolved at evaluation time (meta-expressions like kh(1d2) become the rolled number).

Chained keep/drop modifiers flatten into one list — 4d6kh3dl1 yields two specs against a single pool, each applied independently, with drop sets unioned (Roll20 semantics).

type KeepDropSpec = {
    count: number;
    kind: "keep" | "drop";
    selector: "highest" | "lowest";
}