# https://perlmonks.org/?node_id=11152186
$ ./rtoa-pgatram-allinone2 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