Fixed compatibility with non-POSIX systems (https://github.com/fmtlib/fmt/issues/4054, https://github.com/fmtlib/fmt/issues/4060).

Fixed performance regressions when using std::back_insert_iterator with fmt::format_to (https://github.com/fmtlib/fmt/issues/4070).

Fixed handling of std::generator and move-only iterators (https://github.com/fmtlib/fmt/issues/4053, https://github.com/fmtlib/fmt/pull/4057). Thanks @Arghnews.

Made formatter<std::string_view>::parse work with types convertible to std::string_view (https://github.com/fmtlib/fmt/issues/4036, https://github.com/fmtlib/fmt/pull/4055). Thanks @Arghnews.

Made volatile void* formattable (https://github.com/fmtlib/fmt/issues/4049, https://github.com/fmtlib/fmt/pull/4056). Thanks @Arghnews.

Made Glib::ustring not be confused with std::string (https://github.com/fmtlib/fmt/issues/4052).

Made fmt::context iterator compatible with STL algorithms that rely on iterator category (https://github.com/fmtlib/fmt/issues/4079).