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The chained transform result is particularly striking: pull-through semantics eliminate the intermediate buffering that plagues Web streams pipelines. Instead of each TransformStream eagerly filling its internal buffers, data flows on-demand from consumer to source.
，详情可参考夫子
endSync() { closed = true; return totalBytes; },
events in another app.
（九）接到要求制止违反治安管理行为的报警后，不及时出警的；