The general form: ONE callback for a decision that spans keys. Runs on every patch (no trigger key), checks ctx.patch itself, returns keys to add. Prefer the keyed map when a single field triggers the reaction.
ctx.patch
The general form: ONE callback for a decision that spans keys. Runs on every patch (no trigger key), checks
ctx.patchitself, returns keys to add. Prefer the keyed map when a single field triggers the reaction.