code: public function set($field, $value): int
      {
          return $this->redis->hset($this->key, $field, $this->serialize($value));
      }
docs: @param int|string $field Selected field in which the $value will be set.
  @param mixed      $value Value that will be set in $field.
  
  @return int self::RESPONSE_HASH_SET_FIELD_NEW  if field is a new field in the hash and value was set.
  self::RESPONSE_HASH_SET_FIELD_EXISTING  if field already exists in the hash and the value was
  updated.