Comment by luuio

> why wouldn't doing the same write twice produce an idempotent result

you can imagine this:

```

var thing = KVStore.Get<MyThing>(...);

if (things.Checkpoints.Contains(myUuid) == false) {

  thing.Counter += 1;

}

KVStore.Update(thing); ```

having an etag doesn't help you with retries, where we expect that `thing` could be mutated by another flow between your retries.