Holds references to each instantiation so they can be terminated.
Type: \Drupal\Core\KeyValueStore\DatabaseStorageExpirable[]
protected $storages = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!KeyValueStore!KeyValueDatabaseExpirableFactory.php/property/KeyValueDatabaseExpirableFactory::storages/8.1.x