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# https://perlmonks.org/?node_id=11152156
$ ./rtoa-pgatram-fixed t1.txt t1.txt t1.txt t1.txt | cksum
...
do_it_all time    :    0.515 secs  fast_io scan, line_get
do_it_all time    :    0.490 secs  fast_io memory mapping
737201628 75552000

# https://perlmonks.org/?node_id=11152168 max_workers => 26
$ perl rtoa-pgatram-mce.pl t1.txt t1.txt t1.txt t1.txt | cksum
...
time 0.548 secs   Perl on Fedora Linux 38
time 0.480 secs   Perl on Clear Linux
737201628 75552000

// rtoa-pgatram-allinone2.cpp. Crude allinone version.
//   based on rtoa-pgatram-allinone.cpp https://perlmonks.org/?node_id
+=11152182
...

   return 0;
}