The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
On a cold February afternoon in Manchester, queues of concert-goers are braving the elements outside Co-op Live, the UK's largest indoor arena.
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The couple spent their 37th wedding anniversary in hospital, as well as Manjit Sangha's birthday around Christmas time.
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