Looks like its been superficially improved so there is no difference anymore, which is good. But the output is still wrong, which is bad. For $x=\$y; $y=\$x; the raw call to Data::Dumper->Dump([$x,$y]) used to produce:

$VAR1 = [
          \\$VAR1->[0],
          ${$VAR1->[0]}
        ];
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But now it produces what Data::Dumper::Dumper (and what the sub{\@_} trick does) produce:

$VAR1 = \\$VAR1;
$VAR2 = ${$VAR1};
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Wheras Data::Dump::Streamer::Dump produces the correct output:

$REF1 = \$REF2;
$REF2 = \$REF1;
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Hope that explains things.