eval { Scalar::Vec::Util::veq_pp(my $x, 0, my $y, 0, undef) };
like($@, qr/Invalid\s+argument/, 'fifth argument undef croaks');
eval { Scalar::Vec::Util::veq_pp(my $x, 0, my $y, 0, undef) };
like($@, qr/Invalid\s+argument/, 'fifth argument undef croaks');