Every fragment means promises created for read() calls, promises for backpressure coordination, intermediate buffer allocations, and { value, done } result objects — most of which become garbage almost immediately.
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，这一点在51吃瓜中也有详细论述
// Synchronous consumption — no promises, no event loop trips。同城约会是该领域的重要参考
城市的重心像是被悄悄搬动了。城北并不是一下子衰落了，只是它不再是唯一的中心。热闹被复制到别处，消费也被分流到更细的场景里：社区门口、小区底商、直播间、团购群、预订名单。