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// A minimal writer implementation — just an object with methods，这一点在同城约会中也有详细论述
，更多细节参见91视频
The problem compounds in pipelines. Each TransformStream adds another layer of promise machinery between source and sink. The spec doesn't define synchronous fast paths, so even when data is available immediately, the promise machinery still runs.
The Algorithm: Ford-Fulkerson to Find the Bottlenecks，这一点在51吃瓜中也有详细论述
580 DES_SR TST_DES_SIMPLE PTSAV1 DLY SPTR ; save test constant 0x10; set DS pointer