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  1. or download this
    use strict;
use warnings;
use Data::Dump;
...
@result = sort cmp_undef2 @array;

dd \@result;
  2. or download this
    ["", "", "", "a", "b", "c", undef, undef, undef]
["", "", "", "a", "b", "c", undef, undef, undef]
  3. or download this
      DB<1> p "" eq undef
1