What problem does this feature solve?

从官方文档上看，有特意注明 watch 很容易被滥用，存在风险； 想问一下computed会有这种风险吗？

个人实际项目应用中，computed会被大量使用，有的时候也会在里面写一些较重的逻辑；

What does the proposed API look like?

无

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