When the recalculated values of the dependent computed properties have not changed, the calculated properties of all dependent are recalculated.

[txs1992]

What problem does this feature solve?

Sorry, the following content is not translated accurately, so use Chinese.

Example

当程序中出现链式计算属性依赖时，我们可能希望的是仅当被依赖的计算属性变更时，它所依赖的计算属性才会重新去计算。而不是因为被依赖的计算属性重新计算链了，所以所有依赖它的计算属性都要重新计算。这样在链式的依赖的计算属性中，可以节省很多计算工作。

What does the proposed API look like?

仅当被依赖的计算属性变更时，它所依赖的计算属性才会重新去计算。

[Justineo]

Duplicate of #7767

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And F.Y.I. 2.5.17-beta.0 had shipped this enhancement (#7824) but it caused regression (#8446) so was not included in 2.5.17.