Description
In pull mode, the subscriber is responsible for sending an acknowledge request after fetching messages via pull. While separating the two allows for some advanced usage (e.g., to allow "peeking" at the queue, or to allow retries after certain kinds of errors), some applications might find having to manage the manual acknowledge burdensome.
Should we add a boolean acknowledge_immediately argument to Subscription.pull()? If so, what should its default value be?