$num_data = 7;
$dflt_status = $deflate->deflate($num_data, $dflt_data);

$dflt_status = $deflate->flush($dflt_data);

$iflt_status = $inflate->inflate($dflt_data, $iflt_data);

print hexdump(
  $iflt_data,
  { output_format => '    0x%C' , suppress_warnings => 1}
);

result: 

0x37