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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His book, Lost Moon: The Perilous Voyage of Apollo 13, became the famous 1995 movie, starring Tom Hanks as Jim Lovell.