const res = [];
博主Andy（安迪）來自意大利，曾在中國交換學習一年，今年28歲的他也有積極參與這個熱潮。
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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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