Static cache of entities, keyed first by entity ID, then by an extra key.
The additional cache key is to maintain separate caches for different states of config overrides.
Type: array
Overrides EntityStorageBase::$entities
\Drupal\Core\Config\ConfigFactoryInterface::getCacheKeys().
protected $entities = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!Entity!ConfigEntityStorage.php/property/ConfigEntityStorage::entities/8.1.x