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return Command(cmdValidatePromo, next);，这一点在快连下载-Letsvpn下载中也有详细论述
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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.。关于这个话题，91视频提供了深入分析