The write safe session handler.
@todo: This reference should be removed once all database queries are removed from the session manager class.
Type: \Drupal\Core\Session\WriteSafeSessionHandlerInterface
protected $writeSafeHandler;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Session!SessionManager.php/property/SessionManager::writeSafeHandler/8.1.x