Yes, you'll be able to use etags with if-match for optimistic concurrency. When reading and writing from a Worker, if you do a get() followed by a put() on the

Yes, you'll be able to use etags with if-match for optimistic concurrency. When reading and writing from a Worker, if you do a get() followed by a put() on the same key in the context of the same request, we'll take care of the if-match automatically under the hood, so the put() fails if there was a concurrent write. (This logic is not quite in production yet but should be within a week or two.)