http://www.perlmonks.org?node_id=252173


in reply to Advanced Sorting - GRT - Guttman Rosler Transform

There is a small bug in the example of a Schwartzian Transform.
$a->[0] <=> $a->[0]
should be
$a->[0] <=> $b->[0]
Granted, you did say 'something like this', 8^)