class SectionData

class SectionData extends TypedData {
  
  /**
   * The section object.
   *
   * @var \Drupal\layout_builder\Section
   */
  protected $value;
  
  /**
   * {@inheritdoc}
   */
  public function setValue($value, $notify = TRUE) {
    if (is_array($value)) {
      $value = Section::fromArray($value);
    }
    if ($value && !$value instanceof Section) {
      throw new \InvalidArgumentException(sprintf('Value assigned to "%s" is not a valid section', $this->getName()));
    }
    parent::setValue($value, $notify);
  }

}