The typed data class used for wrapping multiple data items of the type. Must implement the \Drupal\Core\TypedData\ListInterface.
Type: string
public $list_class = '\Drupal\Core\TypedData\Plugin\DataType\ItemList';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!Annotation!DataType.php/property/DataType::list_class/8.1.x