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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Cook all but confirmed that Apple is about to reveal its newest MacBooks in the coming days. His tweet features a short video of someone shaping an Apple logo on a surface that appears to have the company’s classic space gray colorway.，这一点在旺商聊官方下载中也有详细论述
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