[Bug libstdc++/116755] format and print functions prepend extra minus sign for min value of chrono duration type

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116755

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
And I'm not saying *you* should use unsigned types, I'm saying std::format
should cast it to unsigned.