docs: def unparse_qs(qs, sort=False, reverse=False):
      """Reverse conversion for parse_qs"""
      result = []
      items = qs.items()
      if sort:
          items = sorted(items, key=lambda x: x[0], reverse=reverse)
      for keys, values in items:
          query_name = quote(keys)
          for value in values:
              result.append(query_name + "=" + quote(value))
      return "&".join(result)