Arguably, removing the extra expansion for all of the above expansions
returning strings might be less surprising (after thought): they are all string
manipulations without side effects, and so the extra expansion isn't needed,
and passing along '%%' is likelier more useful (at least with %dirname).
Not doing the expansion is rather easy to do with the existing subroutines
(from nearly 20yo memory of the implementation ;-).
Still the issue is an obscure corner case and there are other lurking issues
with escaping like escaped '/' characters in paths (which are more constrained
than strings), and with non-uglix M$_DOS path alternatives like
"C:\HELLO\%%%%\WORLD' (capitals deliberately used).
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