code: public function getArray($keys, array $default = []): array
      {
          $result = $this->get($keys, $default);
          if (!is_array($result)) {
              $result = $default;
          }
          return $result;
      }
docs: Returns an array of values from the data containers.
  @param string|string[] $keys
  @param array $default
  @return array