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  1. or download this
    foo(@a)
  2. or download this
    foo($a[0], $a[1], $a[2], $a[3]);
  3. or download this
    my $old_x = [qw( a b c )];
$memd->set(x => $x);
my $new_x = mem_get('x');  # $new_x = 3 !?