fastjson处理BigDecimal类型比如5.00 转json后变成了5，我想程序里保持我的原值该如何处理呢？

下面是一段测试代码:

List<TestVo> lists = Lists.newArrayList();

        TestVo v1 = new TestVo();
        v1.setId("1");
        v1.setAmt1(2.00);
        BigDecimal b = new BigDecimal(5.00);
        v1.setAmt2(b);

        TestVo v2 = new TestVo();
        v2.setId("1");
        v2.setAmt1(2.00);
        BigDecimal b1 = new BigDecimal(5.00);
        v2.setAmt2(b);

        lists.add(v1);
        lists.add(v2);

        Map map = Maps.newHashMap();
        map.put("data", lists);
        System.out.println(JSON.toJSON(map));

{"data":[{"amt1":2.0,"amt2":5,"id":"1"},{"amt1":2.0,"amt2":5,"id":"1"}]}