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my @array = 1..10;
my $r1 = sub { \@_ }->(@array);
...
}
$_++ foreach @$r1;
print "Original array is still intact! (@array)\n";

my @array = 1..10;
my $r1 = sub { \@_ }->(@array);
...
   print "Chunk: @chunk\n";
}
print "Original array is not intact! (@array)\n";