// ⚠️ 易错点3：此处返回n而非0（完全有序无需排序，长度为0）
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。关于这个话题，雷电模拟器官方版本下载提供了深入分析
To achieve usable performance, every major runtime has resorted to non-standard internal optimizations for Web streams. Node.js, Deno, Bun, and Cloudflare Workers have all developed their own workarounds. This is particularly true for streams wired up to system-level I/O, where much of the machinery is non-observable and can be short-circuited.
func extract2(c chan task) []task {
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