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.
// Producers are supposed to wait for the writer.ready。关于这个话题，服务器推荐提供了深入分析
usePinned { pinnedBytes -。业内人士推荐WPS下载最新地址作为进阶阅读
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