const input = Stream.pull(source, transform1, transform2);
（四）一年以内曾受过治安管理处罚的。。关于这个话题，safew官方版本下载提供了深入分析
。91视频对此有专业解读
The Web streams spec requires promise creation at numerous points — often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.，这一点在Line官方版本下载中也有详细论述
优点：输出范围在 (0,1)，可以表示概率