What TransformStreams are supposed to do is check for backpressure on the controller and use promises to communicate that back to the writer:
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。新收录的资料对此有专业解读
flags = flags | 0b0100; // set bit 2，更多细节参见新收录的资料
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