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        'status' => '0',
        'idat' => '0.80',
        'stdout' => '| pngcrush 1.6.4 .. blah blah full STDOUT here',
        'size' => '1.56'
    };

=head3 C<size>

    { 'size' => '1.56', }

The C<size> key will contain percentage of filesize reduction.

=head3 C<idat>

    { 'idat' => '0.80', }

The C<idat> key will contain the percentage of IDAT size reduction.

=head3 C<total_idat_length>

    { 'total_idat_length' => '1880', }

The C<total_idat_length> key will contain total length of data found in
IDAT chunks.

=head3 C<cpu>