support std::optional holding cv-qualified types#4562
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vitaut merged 1 commit intofmtlib:masterfrom Oct 3, 2025
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# 12.1.0 - 2025-10-29 - Optimized `buffer::append`, resulting in up to ~16% improvement on spdlog benchmarks (fmtlib/fmt#4541). Thanks @fyrsta7. - Worked around an ABI incompatibility in `std::locale_ref` between clang and gcc (fmtlib/fmt#4573). - Made `std::variant` and `std::expected` formatters work with `format_as` (fmtlib/fmt#4574, fmtlib/fmt#4575). Thanks @phprus. - Made `fmt::join<string_view>` work with C++ modules (fmtlib/fmt#4379, fmtlib/fmt#4577). Thanks @Arghnews. - Exported `fmt::is_compiled_string` and `operator""_cf` from the module (fmtlib/fmt#4544). Thanks @CrackedMatter. - Fixed a compatibility issue with C++ modules in clang (fmtlib/fmt#4548). Thanks @tsarn. - Added support for cv-qualified types to the `std::optional` formatter (fmtlib/fmt#4561, fmtlib/fmt#4562). Thanks @OleksandrKvl. - Added demangling support (used in exception and `std::type_info` formatters) for libc++ and clang-cl (fmtlib/fmt#4542, fmtlib/fmt#4560, fmtlib/fmt#4568, fmtlib/fmt#4571). Thanks @FatihBAKIR and @rohitsutreja. - Switched to global `malloc`/`free` to enable allocator customization (fmtlib/fmt#4569, fmtlib/fmt#4570). Thanks @rohitsutreja. - Made the `FMT_USE_CONSTEVAL` macro configurable by users (fmtlib/fmt#4546). Thanks @SnapperTT. - Fixed compilation with locales disabled in the header-only mode (fmtlib/fmt#4550). - Fixed compilation with clang 21 and `-std=c++20` (fmtlib/fmt#4552). - Fixed a dynamic linking issue with clang-cl (fmtlib/fmt#4576, fmtlib/fmt#4584). Thanks @FatihBAKIR. - Fixed a warning suppression leakage on gcc (fmtlib/fmt#4588). Thanks @ZedThree. - Made more internal color APIs `constexpr` (fmtlib/fmt#4581). Thanks @ishani. - Fixed compatibility with clang as a host compiler for NVCC (fmtlib/fmt#4564). Thanks @valgur. - Fixed various warnings and lint issues (fmtlib/fmt#4565, fmtlib/fmt#4572, fmtlib/fmt#4557). Thanks @LiangHuDream and @teruyamato0731. - Improved documentation (fmtlib/fmt#4549, fmtlib/fmt#4551, fmtlib/fmt#4566, fmtlib/fmt#4567, fmtlib/fmt#4578,). Thanks @teruyamato0731, @petersteneteg and @zimmerman-dev.
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Fixes #4561