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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Москвичей предупредили о резком похолодании09:45，更多细节参见51吃瓜
這可能會降低去年特朗普宣布大規模「解放日」關稅時所造成的經濟動盪，也讓其他國家有更多時間準備回應。