code: func (db *DB) XZSort(key []byte, offset int, size int, alpha bool, desc bool, sortBy []byte, sortGet [][]byte) ([][]byte, error) {
  	values, err := db.ZRangeByLex(key, nil, nil, store.RangeClose, 0, -1)
  	if err != nil {
  		return nil, err
  	}
  
  	return db.xsort(values, offset, size, alpha, desc, sortBy, sortGet)
  }
docs: // XZSort sorts zset.