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A difficulty here, however, is that the TransformStreamDefaultController does not have a ready promise mechanism like Writers do; so the TransformStream implementation would need to implement a polling mechanism to periodically check when controller.desiredSize becomes positive again.
，这一点在快连下载安装中也有详细论述
南方周末：肖赛结束后，你是不是几乎一直在路上？
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