I agree that the Perl document does not explicitly state the behavior in this case. But, you could test if it is both a file and a link:
$ perl -e 'printf "%d%d%d%d%d\n", -f "file", -f "link", -l "file", -l
+"link", -f "link" and -l "link"'
Caution: I haven't tested all the combos of files/dirs/links, etc.
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