An array of strings, I would suppose, like the system call.
Then again, Perl doesn't return an array when there's only one alias. Maybe it returns one at most?
$ perl -MData::Dumper -e'print Dumper $_ for (gethostbyname $ARGV)[
$VAR1 = 'www.l.google.com';
$VAR1 = 'www.google.com';
Update: They are space-joined. From pp_sys.c:
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