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.
const dec = new TextDecoder();
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capable of not only reading but, optionally, writing to the magnetic strips on，这一点在heLLoword翻译官方下载中也有详细论述
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