InternalEntry<K, V, ?> e,
        WeakValueReference<K, V, ? extends InternalEntry<K, V, ?>> valueReference) {
      StrongKeyWeakValueEntry<K, V> entry = castForTesting(e);
      @SuppressWarnings("unchecked")
      WeakValueReference<K, V, StrongKeyWeakValueEntry<K, V>> newValueReference =
          (WeakValueReference<K, V, StrongKeyWeakValueEntry<K, V>>) valueReference;