my %mid2num;
my %num2mid;
my @mids = qw(a@b c@d e@f g@h aa@bb aa@cc);
-is_deeply([$d->minmax], [undef,undef], "empty min max on new DB");
+is_deeply([$d->minmax], [0,0], "zero min max on new DB");
foreach my $mid (@mids) {
my $n = $d->mid_insert($mid);