儘管這份工作對身心都有高度要求，麥肯齊表示，沒有任何事能比得上他所經歷的那些令人難以置信的時刻，以及為環境研究作出貢獻的滿足感。
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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.