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.
await dropOld.writer.write(chunk3); // ok, chunk1 discarded。关于这个话题，旺商聊官方下载提供了深入分析
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3. 现场东侧管沟回填采用杂填土，外墙螺杆眼未进行处理进行下一工序施工。（违反《建筑地基基础工程施工规范》GB51004-2015第4.2.1条及《地下工程防水技术规范》GB50108-2008第4.1.28条规定。）。safew官方版本下载对此有专业解读
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The BBC has apologised and called what happened "a serious mistake", saying Davie has instructed the Executive Complaints Unit (ECU) to "complete a fast-tracked investigation and provide a full response to complainants".