my @plain_complement_failed;
for my $ord (0 .. $upper_bound) {
my $ch= chr $ord;
+ my $ord = sprintf "U+%04X", $ord; # For display in Unicode terms
my $plain= $ch=~/$special/ ? 1 : 0;
my $plain_u= $ch=~/$upper/ ? 1 : 0;
push @plain_complement_failed, "$ord-$plain-$plain_u" if $plain == $plain_u;