> So I asked myself if there was some mean to do the reverse from
> "starting as unprivileged and then promoting": starting as root and then
> degrading to unprivileged

IIUC that's exactly how unix always worked,
plan9 otoh flipped it upside down, and so we start unprivileged.
i do think the plan9 way is superior.
check the sorry state of linux bolted-on "rootless" stuff. it all
feels so wrong.

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