return value of from_chars with consumed characters

6 jobs for master in 12 minutes and 41 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Test
passed #7881
debian:10 clang-7-libcpp-17

00:02:21

passed #7880
debian:10 gcc-8-noassert-17

00:02:56

passed #7883
debian:9 clang-3.8-14

00:01:57

passed #7882
debian:9 gcc-6-14

00:01:38

passed #7884
ubuntu:16.04 gcc-5-14

00:01:23

passed #7885
ubuntu:18.04 clang-6-17

00:02:24