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       Parentheses missing around "%s" list
           (W parenthesis) You said something like
...
                 
           Remember that "my", "our", and "local" bind tighter
           than comma.

    substr   => 'seek $fh4 => 0, SEEK_SET or die;
                 my ($char, $data);
                 sysread $fh4 => $data, -s $file;
                 $c4 = 0;
                 $char = substr $data => $c4 ++, 1 for 0 .. length ($d
+ata) - 1'

           Rate  sysread     getc   substr readline
sysread  6.48/s       --     -54%     -60%     -63%
...
substr   16.3/s     152%      16%       --      -6%
readline 17.4/s     169%      24%       7%       --
72192 : 72192 : 72192 : 72192