return new EquivalentToPredicate<>(this, target);
  }

  private static final class EquivalentToPredicate<T>
      implements Predicate<@Nullable T>, Serializable {

    private final Equivalence<T> equivalence;
    @CheckForNull private final T target;

    EquivalentToPredicate(Equivalence<T> equivalence, @CheckForNull T target) {