code: final public function addToList($fieldName, array $values)
      {
          $this->guardFrozenMessage();
          $field = static::schema()->getField($fieldName);
          Assertion::true($field->isAList(), sprintf('Field [%s] must be a list.', $fieldName), $fieldName);
  
          foreach ($values as $value) {
              $field->guardValue($value);
              $this->data[$fieldName][] = $value;
          }
  
          unset($this->clearedFields[$fieldName]);
          return $this;
      }
docs: {@inheritdoc}
  @return static