Expanded class hierarchy of BlockPluginCollection in Drupal 10

class \Drupal\Component\Plugin\LazyPluginCollection implements \Drupal\Component\Plugin\IteratorAggregate, \Drupal\Component\Plugin\Countable
- class \Drupal\Core\Plugin\DefaultSingleLazyPluginCollection uses DependencySerializationTrait
  - class \Drupal\block\BlockPluginCollection
  - class \Drupal\Core\Action\ActionPluginCollection
  - class \Drupal\search\Plugin\SearchPluginCollection

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