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Expanded class hierarchy of DatabaseStorageExpirable in Drupal 9

class \Drupal\Core\KeyValueStore\StorageBase implements KeyValueStoreInterface
- class \Drupal\Core\KeyValueStore\DatabaseStorage uses DependencySerializationTrait
  - class \Drupal\Core\KeyValueStore\DatabaseStorageExpirable implements KeyValueStoreExpirableInterface
    class \Drupal\supercache\KeyValueStore\ChainedStorageExpirable implements KeyValueStoreExpirableInterface uses ChainedStorageTrait
  - class \Drupal\supercache\KeyValueStore\ChainedStorage implements KeyValueStoreInterface uses ChainedStorageTrait
- class \Drupal\Core\KeyValueStore\MemoryStorage