like($@, qr/Arguments\s+must\s+be\s+passed.*unique\s+scalar.*key\s+=>\s+value\s+pairs/, "RW::$_ gets parameters after the first as key => value pairs");
}
eval { $rw->$_(qw<a b c>) };
like($@, qr/Arguments\s+must\s+be\s+passed.*unique\s+scalar.*key\s+=>\s+value\s+pairs/, "RW::$_ gets parameters after the first as key => value pairs");