[Bug libstdc++/110504] New: std::format("{:%S}", duration>(4)) returns "02.0" instead of "02"

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110504

            Bug ID: 110504
           Summary: std::format("{:%S}", duration<long,
                    std::ratio<1,2>>(4)) returns "02.0" instead of "02"
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

And std::format("{:%M:%S}", duration<long, std::ratio<2, 3>>(99)) returns
"01:06.000000" instead of "01:06"