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use strict;
use warnings;
...
$table->associate($db, \&key_sub);
$table->db_put(1,"x|w60");
$table->db_put(2,"y|w61");

Argument "w60" isn't numeric in numeric comparison (<=>) at hhh.pl lin
+e 11.
Argument "w61" isn't numeric in numeric comparison (<=>) at hhh.pl lin
+e 11.
Argument "w60" isn't numeric in numeric comparison (<=>) at hhh.pl lin
+e 11.
Argument "w61" isn't numeric in numeric comparison (<=>) at hhh.pl lin
+e 11.

my $digits = qr/^\d+$/;

...
   return $a <=> $b if ($a =~ $digits and $b =~ $digits);
   return $a cmp $b;
}

    count = perl_call_sv(CurrentDB->compare, G_SCALAR);