export function dual(partition) {
const sort = function (compare, a, i, j) {
if (j - i < 2) return;
const p = partition(compare, a, i, j);
const l = p[0];
const g = p[1];
sort(compare, a, i, l);
sort(compare, a, l + 1, g);
sort(compare, a, g + 1, j);
};
return sort;
}