directory-pathname-p in MCL 5.2

It seems in MCL 5.2 directory-pathname-p was changed to agree more with 
the documentation (or for some other reason), and as such it doesn't 
accept :unspecific as a file name value anymore. This makes 
ensure-directories-exist always break, as it explicitly creates a 
pathname with an :unspecific name, on which directory-pathname-p is then 
called in ccl:create-directory. So what's the right fix? I think 
directory-pathname-p should at least not break on an :unspecific name. 
I'd also argue that a pathname with an :unspecific name is still a 
directory pathname, so directory-pathname-p should return true. Any bad 
consequences of this?

Octav
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