export default function superset(values, other) {
  const iterator = values[Symbol.iterator](), set = new Set();
  for (const o of other) {
    if (set.has(o)) continue;
    let value, done;
    while (({value, done} = iterator.next())) {
      if (done) return false;
      set.add(value);
      if (Object.is(o, value)) break;
    }
  }
  return true;
}