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Update changelog
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Victor Zverovich
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ChangeLog.md
201
ChangeLog.md
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# 12.2.0 - TBD
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- Added a C11 API with type-safe formatting via `_Generic`. The new `fmt-c`
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library and `fmt/fmt-c.h` header allow C code to use {fmt}'s formatter
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with compile-time type checking
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(https://github.com/fmtlib/fmt/issues/4663,
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https://github.com/fmtlib/fmt/pull/4671,
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https://github.com/fmtlib/fmt/pull/4696,
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https://github.com/fmtlib/fmt/issues/4693,
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https://github.com/fmtlib/fmt/pull/4694,
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https://github.com/fmtlib/fmt/pull/4712).
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Thanks @Soumik15630m, @yrlf and @localspook.
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- Reduced binary size of debug builds (~200k to ~85k in the bloat test) and
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improved compile speed when consteval is unavailable.
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- Added a separate `fmt::fmt-module` CMake target for C++20 modules and a
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Linux CI workflow that exercises module-based builds
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(https://github.com/fmtlib/fmt/issues/4684,
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https://github.com/fmtlib/fmt/pull/4685,
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https://github.com/fmtlib/fmt/issues/4707,
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https://github.com/fmtlib/fmt/pull/4708,
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https://github.com/fmtlib/fmt/pull/4702,
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https://github.com/fmtlib/fmt/pull/4709).
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Thanks @MathewBensonCode.
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- Enabled the full Dragonbox lookup cache by default for floating-point
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formatting unless optimizing for binary size (`__OPTIMIZE_SIZE__`),
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giving a ~10–25% speedup. Thanks Matthias Kretz for the suggestion.
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- Improved integer formatting throughput by ~3%
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(https://github.com/fmtlib/fmt/pull/4630). Thanks @user202729.
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- Optimized formatting into back-insert iterators by using bulk container
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append/insert methods (e.g. on `std::vector<char>` and custom string
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types) (https://github.com/fmtlib/fmt/pull/4679). Thanks @user202729.
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- Made path formatting lossless, preserving ill-formed UTF-16
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sequences when converting `std::filesystem::path` to a narrow string.
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- Added overloads of `fmt::println` that take a `fmt::text_style`
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(https://github.com/fmtlib/fmt/pull/4782). Thanks @ahoarau.
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- Added support for formatting `std::unexpected`
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(https://github.com/fmtlib/fmt/pull/4675). Thanks @17steen.
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- Added support for positional arguments as width and precision specifiers
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in `fmt::printf` (https://github.com/fmtlib/fmt/pull/4643).
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Thanks @KareemOtoum.
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- Made `FMT_STRING` a no-op when `FMT_USE_CONSTEVAL` is enabled, since the
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consteval format-string constructor already provides compile-time
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validation
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(https://github.com/fmtlib/fmt/issues/4611,
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https://github.com/fmtlib/fmt/pull/4612). Thanks @friedkeenan.
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- Promoted `fmt::detail::named_arg` to the public API as `fmt::named_arg` and
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deprecated the detail alias
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(https://github.com/fmtlib/fmt/issues/4683,
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https://github.com/fmtlib/fmt/pull/4687). Thanks @TPPPP72.
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- Moved the `std::byte` formatter from `fmt/format.h` to `fmt/std.h`.
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- Provided a default definition for `fmt::is_contiguous`
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(https://github.com/fmtlib/fmt/pull/4731,
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https://github.com/fmtlib/fmt/pull/4770). Thanks @user202729 and @phprus.
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- Added the `FMT_USE_FLOCKFILE` macro to force `has_flockfile` to false
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(https://github.com/fmtlib/fmt/issues/4646,
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https://github.com/fmtlib/fmt/pull/4666). Thanks @MikeVastola.
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- Added `include_guard(GLOBAL)` so that {fmt} can be used in multiple
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submodules of the same project
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(https://github.com/fmtlib/fmt/pull/4672). Thanks @torsten48.
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- Added `constexpr` to argument `value` constructors and to
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`static_format_result` members
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(https://github.com/fmtlib/fmt/pull/4659,
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https://github.com/fmtlib/fmt/pull/4591).
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Thanks @elbeno and @17steen.
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- Deprecated the implicit conversion from `fmt::format_string` and
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`fmt::basic_fstring` to `string_view` to align with `std::format_string`;
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use `format_string::get()` instead.
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- Opted out `std::complex` from tuple formatting so that the dedicated
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`std::complex` formatter is always used.
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- Removed the `fmt::say` function.
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- Deprecated the `std::initializer_list` overload of `fmt::join` and the array
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overload of `fmt::vformat_to`.
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- Made the `<fmt/core.h>` header equivalent to `<fmt/base.h>` by
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default. Code that relied on `<fmt/core.h>` pulling in `<fmt/format.h>`
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must now either include `<fmt/format.h>` directly or define
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`FMT_DEPRECATED_HEAVY_CORE` to opt back in.
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- Improved `wchar_t` support: `fmt::join` now accepts `wchar_t` and other
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non-`char` separators, and `fmt::format_to_n` now works with `fmt::runtime`
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on `wchar_t`
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(https://github.com/fmtlib/fmt/pull/4686,
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https://github.com/fmtlib/fmt/issues/4714,
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https://github.com/fmtlib/fmt/pull/4715).
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Thanks @Yancey2023 and @sunmy2019.
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- Fixed formatting of `std::tm` with a null `tm_zone`
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(https://github.com/fmtlib/fmt/pull/4790). Thanks @JiamiLin.
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- Fixed compile-time formatting in `fmt/ranges.h`, `fmt/style.h` and
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`fmt/std.h` (https://github.com/fmtlib/fmt/pull/4759). Thanks @j4niwzis.
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- Fixed an ambiguity between `formatter<std::optional<T>>` in `fmt/std.h`
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and `fmt/ranges.h` on C++26 (P3168R2)
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(https://github.com/fmtlib/fmt/pull/4761). Thanks @phprus.
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- Fixed a GCC PCH breakage triggered by a scoped `#pragma GCC optimize`.
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- Fixed a TSAN false positive in the locale handling code
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(https://github.com/fmtlib/fmt/issues/4755).
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- Fixed compile-time format string checks truncating string literals at
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an embedded null byte
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(https://github.com/fmtlib/fmt/pull/4732). Thanks @user202729.
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- Fixed an out-of-bounds read in `fmt::vprintf` with a trailing `%`
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(https://github.com/fmtlib/fmt/issues/4741,
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https://github.com/fmtlib/fmt/pull/4742). Thanks @rmarin.
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- Fixed the return type of the `f(un)lockfile` wrappers on Windows
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(https://github.com/fmtlib/fmt/pull/4739). Thanks @MikeVastola.
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- Worked around a CUDA issue when handling UTF-32 literals
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(https://github.com/fmtlib/fmt/pull/4719). Thanks @Cazadorro.
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- Fixed missing named-argument validation for compiled format strings
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(https://github.com/fmtlib/fmt/pull/4638). Thanks @JaeheonShim.
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- Fixed `fmt::format_to_n` in `<fmt/compile.h>` failing to compile when
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`<iterator>` is not transitively included
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(https://github.com/fmtlib/fmt/issues/4615).
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- Fixed handling of pointers in format string compilation with
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`FMT_BUILTIN_TYPES=0`.
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- Stopped assuming nul termination of the format string in `fmt::printf`.
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Thanks @ZUENS2020 for reporting.
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- Fixed a build error when locale support is disabled
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(https://github.com/fmtlib/fmt/pull/4627). Thanks @marcel-behlau-elfin.
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- Fixed a fallback range formatter for types with a `container_type` member
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(https://github.com/fmtlib/fmt/issues/4123,
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https://github.com/fmtlib/fmt/pull/4660). Thanks @Soumik15630m.
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- Fixed C++20 concept detection
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(https://github.com/fmtlib/fmt/pull/4653). Thanks @lagoho7.
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- Fixed a clang compilation failure
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(https://github.com/fmtlib/fmt/pull/4718). Thanks @mccakit.
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- Fixed various MSVC warnings, including C4305 and conversion warnings on
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x86 (https://github.com/fmtlib/fmt/pull/4668,
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https://github.com/fmtlib/fmt/pull/4594).
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Thanks @kanren3 and @JBerger.
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- Updated the Android Gradle Plugin to 9.x
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(https://github.com/fmtlib/fmt/issues/4651,
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https://github.com/fmtlib/fmt/pull/4658). Thanks @Soumik15630m.
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- Made various code, build and test improvements
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(https://github.com/fmtlib/fmt/pull/4625,
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https://github.com/fmtlib/fmt/pull/4639,
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https://github.com/fmtlib/fmt/pull/4644,
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https://github.com/fmtlib/fmt/pull/4656,
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https://github.com/fmtlib/fmt/pull/4680,
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https://github.com/fmtlib/fmt/pull/4681,
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https://github.com/fmtlib/fmt/pull/4704,
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https://github.com/fmtlib/fmt/pull/4710,
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https://github.com/fmtlib/fmt/pull/4713,
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https://github.com/fmtlib/fmt/pull/4729,
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https://github.com/fmtlib/fmt/pull/4751,
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https://github.com/fmtlib/fmt/pull/4758).
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Thanks @ZephyrLykos, @togunchan, @kagancansit, @BerndPetrovitsch,
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@Skylion007, @st0rmbtw and @localspook.
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- Improved documentation, including a rewrite of the format string syntax,
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better handling of doxygen tags, documenting `output_file`, fixing CSS so
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that whitespace is displayed properly, and various smaller fixes
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(https://github.com/fmtlib/fmt/pull/4622,
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https://github.com/fmtlib/fmt/pull/4626,
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https://github.com/fmtlib/fmt/pull/4631,
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https://github.com/fmtlib/fmt/pull/4667,
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https://github.com/fmtlib/fmt/pull/4616,
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https://github.com/fmtlib/fmt/pull/4748).
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Thanks @heavywatal, @ZephyrLykos, @user202729, @ssszcmawo, @bigmoonbit
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and @Powerbyte7.
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- Added building of release artifacts and SLSA provenance in CI, added a
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CodeQL workflow, and added the security policy in `.github/SECURITY.md`.
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# 12.1.0 - 2025-10-29
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- Optimized `buffer::append`, resulting in up to ~16% improvement on spdlog
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