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$ NUM_THREADS=1  ./rtoa-pgatram-allinone2b t1.txt t1.txt t1.txt t1.txt
+ | cksum
do_it_all time    :    0.498 secs
...
real    0m0.093s
user    0m1.858s
sys     0m0.103s

# https://perlmonks.org/?node_id=11152168 max_workers => 32
$ time perl rtoa-pgatram-mce.pl t1.txt t1.txt t1.txt t1.txt | cksum
...
real    0m0.449s
user    0m21.884s
sys     0m0.592s

// rtoa-pgatram-allinone2b.cpp. Crude allinone version.
//   based on rtoa-pgatram-allinone2.cpp https://perlmonks.org/?node_i
+d=11152186
...

   return 0;
}