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.
non-technical people. However, the quality of the generated code may vary，推荐阅读heLLoword翻译官方下载获取更多信息
Replicate Toggle。夫子对此有专业解读
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