#4518
Optimize the default FP presentation
The default FP presentation (formatting of the significand and exponent after they are produced by Dragonbox) can be slightly optimized, possibly using some ideas from jkj::dragonbox::detail::to_chars<...>: https://github.com/fmtlib/fmt/issues/3675#issuecomment-3172953795.
Will use https://github.com/vitaut/zmij which is now feature-complete.