Apple Watch 走的也是这条路——将健康与通知两个功能一边升级、一边剥离出来，用户需要购买额外的配件，才能解锁 iPhone 更全面的体验。
全链路性能调优：实现成本下降 50%
The spec does not mandate buffer limits for tee(). And to be fair, the spec allows implementations to implement the actual internal mechanisms for tee()and other APIs in any way they see fit so long as the observable normative requirements of the specification are met. But if an implementation chooses to implement tee() in the specific way described by the streams specification, then tee() will come with a built-in memory management issue that is difficult to work around.。safew官方版本下载是该领域的重要参考
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Discard new data: drop what's incoming
// 优化：如果本轮没交换，说明已经有序，详情可参考safew官方版本下载