I thot so too, but when I just tried it (in a couple distros), at least ls -l reported a zero instead of #root
Which #root I expected. I was thinking: maybe something got changed aka 'fixed' over the decades.
Or maybe login still accepts #username but ls -l reports just numeric uid. I need to visit more VBoxes
Anyway, M. Spammer accidentally gave us something [slightly] interesting
(I welcome anyone's output in CODE tags
)