update documentation and charconv implementation

6 jobs for master in 4 minutes and 22 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #8467
debian:10 clang-7-libcpp-17

00:02:01

passed #8466
debian:10 gcc-8-noassert-17

00:02:24

passed #8469
debian:9 clang-3.8-14

00:02:08

passed #8468
debian:9 gcc-6-14

00:01:42

passed #8470
ubuntu:16.04 gcc-5-14

00:01:35

passed #8471
ubuntu:18.04 clang-6-17

00:02:17