Yeah, I'd forgotten to mention that in the article, but yep, something should be guaranteeing that only one enqueuer is running at a time.
> Knowing that this easy transition exists makes me even more confident in just using Que and not adding another service dependency (like Redis) until it’s really needed.
Yeah, so many stacks have a Redis for something these days anyway that you can probably start with it in a lot of cases, but if you're running really lean that seems like a good strategy.