// Nothing executes until iteration begins
宏福苑大火兩個月：重覓家園路在何方？災後重建難題待解，这一点在safew官方下载中也有详细论述
The problem gets worse in pipelines. When you chain multiple transforms – say, parse, transform, then serialize – each TransformStream has its own internal readable and writable buffers. If implementers follow the spec strictly, data cascades through these buffers in a push-oriented fashion: the source pushes to transform A, which pushes to transform B, which pushes to transform C, each accumulating data in intermediate buffers before the final consumer has even started pulling. With three transforms, you can have six internal buffers filling up simultaneously.，更多细节参见搜狗输入法下载
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