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kotlinlang

Thanks for the details. What I do not quite understand is the meaning of `source location` in `unique to the source location of the call site.` in the blog, and in your explanation the meaning of `source property` in  `you introduce a key that is combined with the source property to introduce a group specific key.`

the compiler will create a unique integer for each call site of a composable function . This is used to automatically ensure that each call site is considered unique in the eyes of the memoization

this is important since different call-sites can have different number of parameters, and thus consult the memoization cache a different number of times, which would result in misalignment

however, sometimes you also want to track with the identity of the data or something. we introduced `Key` and `@Pivotal` to deal with this

so i can have a parameter be labeled as pivotal, which means that in addition the the source location integer being used, we will also check the parameter, and trigger moves/inserts/deletes based on that