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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（一）被处罚人的姓名、性别、年龄、身份证件的名称和号码、住址；，更多细节参见safew官方下载
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The locking problem
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