Untitled

multi infix:<+> ($a, $b) is default {
    given ($a, $b) {
        when (Iterable, Iterable) { $a «+» $b }
        when (Iterable, Any) { $a.map(* + $b) }
        when (Any, Iterable) { $b.map(* + $a) }
        default { $a + $b }
    }
}

say (1, 2, 3) + 5;
say 5 + (4, 5, 6);
say (1, 2, 3) + (4, 5, 6);