refactor: move away from "setValues" #9848
Draft
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This is a draft PR and a work in progress. The ultimate goal of it is to move away from the "setValues" function that we pass around in favor of more action-oriented "addValues", "clearValues", "removeValues" functions.
Why? Initially, it was to take away the burden of having to deduplicate incoming values and merging them with the existing values downstream. This feels like internal logic that they shouldn't have to deal with. Locking down the API like that also makes it easier to test.