private Object readResolve() {
      return INSTANCE;
    }

    private static final long serialVersionUID = 1;
  }

  static final class Identity extends Equivalence<Object> implements Serializable {

    static final Identity INSTANCE = new Identity();

    @Override
    protected boolean doEquivalent(Object a, Object b) {
      return false;
    }

    @Override

    private Object readResolve() {
      return INSTANCE;
    }

    private static final long serialVersionUID = 1;
  }

  static final class Identity extends Equivalence<Object> implements Serializable {

    static final Identity INSTANCE = new Identity();

    @Override
    protected boolean doEquivalent(Object a, Object b) {
      return false;
    }

    @Override