strict.writer.write(chunk1); // ok (not awaited)
controller.enqueue(chunk);。关于这个话题，safew官方版本下载提供了深入分析
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91视频
Include test results (accuracy on random pairs)
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