我国每年约有1.5亿跨省流动人口。通过全面取消在就业地参保户籍限制、推动公积金异地取用等，我国劳动力和人才得以顺畅流动，集聚能力显著增强。
The writer has a simple interface: write(), writev() for batched writes, end() to signal completion, and abort() for errors. That's essentially it.
，这一点在电影中也有详细论述
Sync[F].delay(println(s"Receiving [tid=$id] $msg"))，详情可参考Feiyi
IsEquivalent[T, S]: