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Equal (5): Everything in this space must be equal to 5. The answer is 5-5, placed vertically; 5-1, placed horizontally.。旺商聊官方下载对此有专业解读
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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.