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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.，更多细节参见heLLoword翻译官方下载
坚持精准方略，激发内力，调动广大农民的积极性、主动性、创造性。，详情可参考safew官方下载
FT Edit: Access on iOS and web，更多细节参见51吃瓜