Expanded class hierarchy of LazyPluginCollection in Drupal 9
- class \Drupal\Component\Plugin\LazyPluginCollection implements \Drupal\Component\Plugin\IteratorAggregate, \Drupal\Component\Plugin\Countable
- class \Drupal\Core\Plugin\DefaultLazyPluginCollection uses DependencySerializationTrait
- class \Drupal\Core\Plugin\DefaultSingleLazyPluginCollection uses DependencySerializationTrait
- class \Drupal\plugin_test\Plugin\TestLazyPluginCollection