查看配置项超大整型数值时，前端展示数值溢出，显示不准

[hezhaoye]

namespace是properties格式，key的内容是一个json字符串，里面有key是超大数值类型，点击查看配置，展示出来的数值存在溢出，显示不准，这个要怎么修复下呢

[nobodyiam]

I believe this was fixed by #4183.

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