@SuppressWarnings("nullness") // TODO: b/423853632 - Remove after checker is fixed.
    private static <K extends @Nullable Object, V extends @Nullable Object>
        Predicate<Entry<V, K>> inversePredicate(Predicate<? super Entry<K, V>> forwardPredicate) {
      return input -> forwardPredicate.apply(immutableEntry(input.getValue(), input.getKey()));
    }