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  1. or download this
    my $v1 = vector(1,2,3,4,5);
    my @filter = qw(1 0 0 1 1);
    my $cv = computed($v1);
    $cv->set_filter(@filter);
    
  2. or download this
    my $v1  = vector(1,2,3,4,5);
    my $compV1 = computed($v1);
    ...
    say $compV1;
    $compV1-> set_filter( sub { grep { $filter[$_] } 0..$#_ } );
    say $compV1;
    
  3. or download this
    [1, 2, 3, 5, 7]
    [0, 1, 2, 3]