}

    @Override
    protected String doBackward(Integer value) {
      return value.toString();
    }

    @Override
    public String toString() {
      return "Ints.stringConverter()";
    }

    private Object readResolve() {
      return INSTANCE;
    }

    private static final long serialVersionUID = 1;
  }

  /**

    }

    @Override
    protected String doBackward(Double value) {
      return value.toString();
    }

    @Override
    public String toString() {
      return "Doubles.stringConverter()";
    }

    private Object readResolve() {
      return INSTANCE;
    }

    private static final long serialVersionUID = 1;
  }

  /**

    }

    @Override
    protected String doBackward(Long value) {
      return value.toString();
    }

    @Override
    public String toString() {
      return "Longs.stringConverter()";
    }

    private Object readResolve() {
      return INSTANCE;
    }

    private static final long serialVersionUID = 1;
  }

  /**