This is fundamentally different from Web streams' pipeThrough(), which starts actively pumping data from the source to the transform as soon as you set up the pipe. Pull semantics mean you control when processing happens, and stopping iteration stops processing.
Which branch triggered it。关于这个话题，爱思助手下载最新版本提供了深入分析
So the argument was never whether we should add nested scopes.，这一点在im钱包官方下载中也有详细论述
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