union alloc_header *h = x;h--;
The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
，这一点在91视频中也有详细论述
If you enable --privileged just to get CAP_SYS_ADMIN for nested process isolation, you have added one layer (nested process visibility) while removing several others (seccomp, all capability restrictions, device isolation). The net effect is arguably weaker isolation than a standard unprivileged container. This is a real trade-off that shows up in production. The ideal solutions are either to grant only the specific capability needed instead of all of them, or to use a different isolation approach entirely that does not require host-level privileges.
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