I don't get it. When Purity=0 DD, doesn't claim to reevaluate correctly and it's frequently more readable. When Purity=1, it seems to work perfectly for me.

Here's something that takes your examples above, DDDumps them with Purity=1 and reevals the string and then shows the Streamer version of the original and of the evaled.

use Data::Dumper;
use Data::Dump::Streamer;
$Data::Dumper::Purity=1;

my ($x,$y);
$x=\$y;
$y=\$x;
test([$x, $y]);

my $ary=[];
$ary->[0]=\$ary->[1];
$ary->[1]=\$ary->[0];

test($ary);

sub test
{
  my $VAR1;
  my $s = shift;
  my $d = Dumper($s);
  my $s2 = eval "$d;\$VAR1";
  die $@ if $@;
  print "original---------------\n";
  print Dump($s);
  print "DDed---------------\n";
  print Dump($s2);
  print "\n"
}
__END__
original---------------
$ARRAY1 = [
            \do { my $v = 'V: $ARRAY1->[1]' },
            \do { my $v = 'V: $ARRAY1->[0]' }
          ];
${$ARRAY1->[0]} = $ARRAY1->[1];
${$ARRAY1->[1]} = $ARRAY1->[0];
DDed---------------
$ARRAY1 = [
            \do { my $v = 'V: $ARRAY1->[1]' },
            \do { my $v = 'V: $ARRAY1->[0]' }
          ];
${$ARRAY1->[0]} = $ARRAY1->[1];
${$ARRAY1->[1]} = $ARRAY1->[0];

original---------------
$ARRAY1 = [
            'R: $ARRAY1->[1]',
            'R: $ARRAY1->[0]'
          ];
$ARRAY1->[0] = \$ARRAY1->[1];
$ARRAY1->[1] = \$ARRAY1->[0];
DDed---------------
$ARRAY1 = [
            \do { my $v = 'V: $ARRAY1->[1]' },
            \do { my $v = 'V: $ARRAY1->[0]' }
          ];
${$ARRAY1->[0]} = $ARRAY1->[1];
${$ARRAY1->[1]} = $ARRAY1->[0];
[download]

The first one comes out identical. The second one is not textually identical but if ${$x} = $y means the same thing as $x = \$y then I can't see what DD did wrong. Do they mean the same thing?

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