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  1. or download this
        ( undef ) = do{ 
          local $/; 
          open my $fh, '< :raw',  $file or die $!; 
          <$fh> 
      };
  2. or download this
    P:\test>354830

...
readfwd              23.6/s      1797%         --                -98% 
+     -100%
File::ReadBackwards  1051/s     84542%      4363%                  -- 
+      -93%
rawio               14894/s   1198858%     63119%               1316% 
+        --