Investigate using Daniel Lemire's parsing algorithm

[grisumbras]

https://lemire.me/blog/2021/01/29/number-parsing-at-a-gigabyte-per-second/

[vinniefalco]

gigabytes per second sounds guud

[grisumbras]

https://github.com/lemire/fast_double_parser

[pdimov]

microsoft/STL#1610