One rule: fires when its record key is in the patch. value is the patch value at that key — the patch itself is untyped, so the parameter annotation is the author's claim about what the key holds. Return the keys to add to the patch, or nothing.
value
One rule: fires when its record key is in the patch.
valueis the patch value at that key — the patch itself is untyped, so the parameter annotation is the author's claim about what the key holds. Return the keys to add to the patch, or nothing.