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Expanded class hierarchy of ItemStorage in Drupal 9

class \Drupal\Core\Entity\EntityHandlerBase uses DependencySerializationTrait, StringTranslationTrait
- class \Drupal\Core\Entity\EntityAccessControlHandler implements EntityAccessControlHandlerInterface
- class \Drupal\Core\Entity\EntityListBuilder implements EntityHandlerInterface, EntityListBuilderInterface uses MessengerTrait, RedirectDestinationTrait
- class \Drupal\Core\Entity\EntityStorageBase implements EntityHandlerInterface, EntityStorageInterface
  - class \Drupal\Core\Config\Entity\ConfigEntityStorage implements ConfigEntityStorageInterface, ImportableEntityStorageInterface
  - class \Drupal\Core\Entity\ContentEntityStorageBase implements ContentEntityStorageInterface, DynamicallyFieldableEntityStorageInterface
    class \Drupal\Core\Entity\ContentEntityNullStorage
    
    class \Drupal\Core\Entity\Sql\SqlContentEntityStorage implements EntityBundleListenerInterface, DynamicallyFieldableEntityStorageSchemaInterface, SqlEntityStorageInterface
    class \Drupal\aggregator\FeedStorage implements FeedStorageInterface
    
    class \Drupal\aggregator\ItemStorage implements ItemStorageInterface
    
    class \Drupal\asset\AssetStorage
    
    class \Drupal\bibcite_entity\ContributorStorage
    
    class \Drupal\bibcite_entity\ReferenceStorage
    
    class \Drupal\build_hooks\DeploymentStorageHandler implements DeploymentStorageHandlerInterface
    
    class \Drupal\business_rules\ScheduleStorage implements ScheduleStorageInterface
    
    class \Drupal\comment\CommentStorage implements CommentStorageInterface
    
    class \Drupal\config_entity_revisions\Entity\Handler\ConfigEntityRevisionsStorage implements ConfigEntityRevisionsStorageInterface
    
    class \Drupal\course\Storage\CourseObjectFulfillmentStorage
    
    class \Drupal\course\Storage\CourseObjectStorage
    
    class \Drupal\easy_email\EasyEmailStorage implements EasyEmailStorageInterface
    
    class \Drupal\entity_test\EntityTestNoLoadStorage
    
    class \Drupal\entity_test_update\EntityTestUpdateStorage
    
    class \Drupal\file\FileStorage implements FileStorageInterface
    
    class \Drupal\fillpdf\FillPdfFormFieldStorage
    
    class \Drupal\flag_lists\FlaggingCollectionStorage implements FlaggingCollectionStorageInterface
    
    class \Drupal\gdpr_consent\ConsentAgreementStorage implements ConsentAgreementStorageInterface
    
    class \Drupal\group\Entity\Storage\GroupContentStorage implements GroupContentStorageInterface
    
    class \Drupal\group\Entity\Storage\GroupStorage
    
    class \Drupal\log\LogStorage
    
    class \Drupal\media\MediaStorage
    
    class \Drupal\menu_link_content\MenuLinkContentStorage implements MenuLinkContentStorageInterface
    
    class \Drupal\node\NodeStorage implements NodeStorageInterface
    
    class \Drupal\opigno_calendar_event\CalendarEventStorage
    
    class \Drupal\opigno_module\OpignoAnswerStorage implements OpignoAnswerStorageInterface
    
    class \Drupal\path_alias\PathAliasStorage
    
    class \Drupal\photos\PhotosImageStorage implements PhotosImageStorageInterface
    
    class \Drupal\plan\PlanStorage
    
    class \Drupal\pm_expense\ExpenseStorage implements ExpenseStorageInterface
    
    class \Drupal\pm_invoice\InvoiceStorage implements InvoiceStorageInterface
    
    class \Drupal\pm_issue\IssueStorage implements IssueStorageInterface
    
    class \Drupal\pm_organization\OrganizationStorage implements OrganizationStorageInterface
    
    class \Drupal\pm_project\ProjectStorage implements ProjectStorageInterface
    
    class \Drupal\quiz\Storage\QuizQuestionStorage
    
    class \Drupal\quiz\Storage\QuizResultAnswerStorage
    
    class \Drupal\quiz\Storage\QuizStorage
    
    class \Drupal\radioactivity\RadioactivityStorage
    
    class \Drupal\rng\RegistrationStorage
    
    class \Drupal\salesforce_mapping\MappedObjectStorage
    
    class \Drupal\simplenews\Subscription\SubscriptionStorage implements SubscriptionStorageInterface
    
    class \Drupal\simple_megamenu\SimpleMegaMenuStorage implements SimpleMegaMenuStorageInterface
    
    class \Drupal\smart_date_recur\RuleStorage implements RuleStorageInterface
    
    class \Drupal\smart_date_recur\RuleStorage implements RuleStorageInterface
    
    class \Drupal\smart_date_recur\RuleStorage implements RuleStorageInterface
    
    class \Drupal\smart_date_recur\RuleStorage implements RuleStorageInterface
    
    class \Drupal\smart_date_recur\RuleStorage implements RuleStorageInterface
    
    class \Drupal\smart_date_recur\RuleStorage implements RuleStorageInterface
    
    class \Drupal\taxonomy\TermStorage implements TermStorageInterface
    
    class \Drupal\user\UserStorage implements UserStorageInterface
    
    class \Drupal\webform\WebformSubmissionStorage implements WebformSubmissionStorageInterface uses WebformEntityStorageTrait
  - class \Drupal\Core\Entity\KeyValueStore\KeyValueEntityStorage
- class \Drupal\Core\Entity\EntityViewBuilder implements EntityHandlerInterface, EntityViewBuilderInterface, TrustedCallbackInterface
- class \Drupal\Tests\Core\Entity\TestEntityForm
- class \Drupal\Tests\Core\Entity\TestEntityHandlerBase
- class \Drupal\Tests\Core\Entity\TestRouteProvider