Here's a scalable, undef-friendly solution, just for kicks:
my $multiple_values;
my ($k,$v);
use Data::Dumper;
$Data::Dumper::Useqq = 1;
while (defined($k = each %hash)) {
if ($v) {
++$multiple_values, last if Dumper($hash{$k}) ne $v;
} else {
$v = Dumper($hash{$k})
}
}
It does distinguish between strings and numbers that eq would say were the same, though.
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