in src/Diff.php [45:50]
public function __construct(vec<this::TContent> $a, vec<this::TContent> $b) {
$this->a =
Vec\map_with_key($a, ($k, $v) ==> shape('content' => $v, 'pos' => $k));
$this->b =
Vec\map_with_key($b, ($k, $v) ==> shape('content' => $v, 'pos' => $k));
}