I would say that there is a misconception. C: does not reference the root directory of a volume. It references the current working directory of that volume.
You should either prohibit this or handle it properly, not silently convert to something else, especially not a root directory. I think the failure mode of converting C: to C:/ is a very bad one:
my $p= path("C:");
unlink $_ for $p->children;
For UNC paths, I see no such bad failure mode of appending a trailing directory separator.
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