输出：[null,1,1,1,2,1,4,6]
FT App on Android & iOS，这一点在Line官方版本下载中也有详细论述
In addition to seeing the differences between versions (36 upgraded packages, 3 new ones), we can also see the additional packages I’ve installed on top of the base image (LayeredPackages). I can also ask ostree to display the commit content, just like I would with git show.，更多细节参见heLLoword翻译官方下载
If the transform's transform() operation is synchronous and always enqueues output immediately, it never signals backpressure back to the writable side even when the downstream consumer is slow. This is a consequence of the spec design that many developers completely overlook. In browsers, where there's only a single user and typically only a small number of stream pipelines active at any given time, this type of foot gun is often of no consequence, but it has a major impact on server-side or edge performance in runtimes that serve thousands of concurrent requests.