return (runtimeType instanceof Class) && ((Class<?>) runtimeType).isPrimitive();
  }

  /**
   * Returns the corresponding wrapper type if this is a primitive type; otherwise returns {@code
   * this} itself. Idempotent.
   *
   * @since 15.0
   */
  public final TypeToken<T> wrap() {
    if (isPrimitive()) {
      @SuppressWarnings("unchecked") // this is a primitive class
      Class<T> type = (Class<T>) runtimeType;

        }
    }

    @Test
    public void test_completeOperation_doubleCall_safe() {
        // Calling completeOperation twice must not throw (idempotent release)
        final AtomicInteger callCount = new AtomicInteger(0);
        final CoordinatorHelper helper = new CoordinatorHelper() {
            @Override