Errto has got it, I think!

#!perl -w
use CGI::Util qw(rearrange);
sub showval {
  return defined($_[0])?$_[0]:"<undef>"
}
sub testcall {
  my (@p) = @_;
    my($name,$values,$default,$labels,$attributes,$override,$tabindex,
+@other) =
       rearrange([NAME,[VALUES,VALUE],[DEFAULT,DEFAULTS],LABELS,
       ATTRIBUTES,[OVERRIDE,FORCE],TABINDEX],@p);
   print "name       = ", showval($name), "\n";
   print "values     = ", showval($values), "\n";
   print "labels     = ", showval($labels), "\n";
   print "attributes = ", showval($attributes), "\n";
   print "override   = ", showval($override), "\n";
   print "tabindex   = ", showval($tabindex), "\n";
   print "\@other = ", join("  ", @other), "\n";
}

sub vooba {
  my @result = ("foo", "bar");
  print "vooba: wantarray = ", wantarray, "\n";
  return @result;
}
sub emptylist {
  my @result = ();
  return @result;
}
print "testcall1\n";
testcall(
  -name     => "nameparm",
  -values    => [ "array" ],
  -labels    => "labels",
  -default => vooba(),
);

print "\ntestcall2\n";
testcall(
  -name     => "nameparm",
  -values    => [ "array" ],
  -default => vooba(),
  -labels    => "labels",
);

print "\ntestcall3\n";
testcall(
  -name     => "nameparm",
  -values    => [ "array" ],
  -default => emptylist(),
  -labels    => "labels",
);

__END__
[download]

Output:

testcall1
vooba: wantarray = 1
name       = nameparm
values     = ARRAY(0x225848)
labels     = labels
attributes = <undef>
override   = <undef>
tabindex   = <undef>
@other = bar

testcall2
vooba: wantarray = 1
name       = nameparm
values     = ARRAY(0x225848)
labels     = <undef>
attributes = <undef>
override   = <undef>
tabindex   = <undef>
@other = bar="-labels"

testcall3
name       = nameparm
values     = ARRAY(0x225848)
labels     = <undef>
attributes = <undef>
override   = <undef>
tabindex   = <undef>
@other =
[download]

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