docs: @Override
    @SuppressWarnings("unchecked")
    public UserManagedCacheBuilder<K, V, PersistentUserManagedCache<K, V>> builder(UserManagedCacheBuilder<K, V, ? extends UserManagedCache<K, V>> builder) {
      return (UserManagedCacheBuilder<K, V, PersistentUserManagedCache<K, V>>) builder.identifier(identifier).using(persistenceService);
    }