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.
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Yorkshire plant has been criticised for taking material from some of British Columbia’s most environmentally important forests
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One of these setups could process almost a thousand checks a minute with a