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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「像鬼一樣工作」：台灣外籍移工為何陷入「強迫勞動」處境
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We're not going to tell you what happens in it, just that it exists, and you should watch it. Most of the Bridgerton cast members appear in it, and it's worth your time. Just don't let Netflix send you automatically to another show as the credits start rolling.
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