> actually it works undef is not cast to "" and hence less than empty string
No, it works because sort is stable and you declared the lucky case to be the input. Try again with
use List::Util qw{ shuffle };
my @array = shuffle((undef) x 3, qw/c b a/, ("") x 3);
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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