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controller.enqueue(generateData()); // desiredSize: -999999
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Postcard is a simple binary format that is more compact than JSON and much simpler to parse.，详情可参考体育直播
For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.，这一点在旺商聊官方下载中也有详细论述
let traceIndex = 0;