TheDamian's
Quantum::Superpositions module can do this.
Although it is slow, the code is quite readable:
use Quantum::Superpositions;
my @a = (1,2,3,4,5,6,7,8,9,10); # integers
my @b = (2,4,6,8,10,12,14,16,18,20); # doubled
my @unionAB = sort { $a <=> $b } eigenstates( any(@a, @b) );
my @intersectionAB = sort { $a <=> $b } eigenstates( any(@a) == any(@b
+) );
my @differenceAB = sort { $a <=> $b } eigenstates( any(@a) != all(@b
+) );
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