fmt/ChangeLog.md

# 11.0.0 - TBD

- Added `fmt/base.h` which provides a subset of the API with minimal include
  dependencies and enough functionality to replace all uses of `*printf`.
  This brings the compile time of code using {fmt} much closer to the
  equivalent `printf` code as shown on the following benchmark that compiles
  100 source files:

  | Method       | Compile Time (s) |
  |--------------|------------------|
  | printf       | 1.6              |
  | IOStreams    | 25.9             |
  | fmt          | 4.8              |
  | tinyformat   | 29.1             |
  | Boost Format | 55.0             |

  Note that this is purely formatting code and includes. In real projects the
  difference will be smaller partly because common standard headers will be
  included in almost any translation unit anyway.

- Optimized includes in other headers such as `fmt/format.h` which is now
  roughly equivalent to the old `fmt/core.h`.

- Improved C++20 module support
  (https://github.com/fmtlib/fmt/issues/3990,
  https://github.com/fmtlib/fmt/pull/3991,
  https://github.com/fmtlib/fmt/issues/3993,
  https://github.com/fmtlib/fmt/pull/3994,
  https://github.com/fmtlib/fmt/pull/3997,
  https://github.com/fmtlib/fmt/pull/3998,
  https://github.com/fmtlib/fmt/pull/4004,
  https://github.com/fmtlib/fmt/pull/4005,
  https://github.com/fmtlib/fmt/pull/4013). In particular, native CMake support
  for modules is now used if available. Thanks @yujincheng08.

- Added an option to replace standard includes with `import std` enabled via
  the `FMT_IMPORT_STD` macro (https://github.com/fmtlib/fmt/issues/3921,
  https://github.com/fmtlib/fmt/pull/3928). Thanks @matt77hias.

- Exported `fmt::range_format`, `fmt::range_format_kind` and
  `fmt::compiled_string` from the `fmt` module
  (https://github.com/fmtlib/fmt/pull/3970,
  https://github.com/fmtlib/fmt/pull/3999).
  Thanks @matt77hias and @yujincheng08.

- Improved integration with stdio in `fmt::print`, enabling direct writes
  into a C stream buffer in common cases. This may give significant
  performance improvements ranging from tens of percent to [2x](
  https://stackoverflow.com/a/78457454/471164) and eliminates dynamic memory
  allocations on the buffer level. It is currently enabled for built-in and
  string types with wider availability coming up in future releases.

  For example, it gives ~24% improvement on a [simple benchmark](
  https://isocpp.org/files/papers/P3107R5.html#perf) compiled with Apple clang
  version 15.0.0 (clang-1500.1.0.2.5) and run on macOS 14.2.1:

  ```
  -------------------------------------------------------
  Benchmark             Time             CPU   Iterations
  -------------------------------------------------------
  printf             81.8 ns         81.5 ns      8496899
  fmt::print (10.*)  63.8 ns         61.9 ns     11524151
  fmt::print (11.0)  51.3 ns         51.0 ns     13846580
  ```

- Improved safety of `fmt::format_to` when writting to an array
  (https://github.com/fmtlib/fmt/pull/3805).
  For example ([godbolt](https://www.godbolt.org/z/cYrn8dWY8)):

  ```c++
  auto volkswagen = char[4];
  auto result = fmt::format_to(volkswagen, "elephant");
  ```

  no longer results in a buffer oveflow. Instead the output will be truncated
  and you can get the end iterator and whether truncation occurred from the
  `result` object. Thanks @ThePhD.

- Enabled Unicode support by default in MSVC, bringing it on par with other
  compilers and making it unnecessary for users to enable it explicitly.
  Most of {fmt} is encoding-agnostic but this prevents mojibake in places
  where encoding matters such as path formatting and terminal output.
  You can control the Unicode support via the CMake `FMT_UNICODE` option.
  Note that some {fmt} packages such as the one in vcpkg have already been
  compiled with Unicode enabled.

- Added a formatter for `std::expected`
  (https://github.com/fmtlib/fmt/pull/3834. Thanks @dominicpoeschko.

- Added a formatter for `std::complex`
  (https://github.com/fmtlib/fmt/issues/1467,
  https://github.com/fmtlib/fmt/issues/3886,
  https://github.com/fmtlib/fmt/pull/3892,
  https://github.com/fmtlib/fmt/pull/3900). Thanks @phprus.

- Added a formatter for `std::type_info`
  (https://github.com/fmtlib/fmt/pull/3978). Thanks @matt77hias.

- Specialized `formatter` for `std::basic_string` types with custom traits
  and allocators (https://github.com/fmtlib/fmt/issues/3938,
  https://github.com/fmtlib/fmt/pull/3943). Thanks @dieram3.

- Added formatters for `std::chrono::day`, `std::chrono::month`,
  `std::chrono::year` and `std::chrono::year_month_day`
  (https://github.com/fmtlib/fmt/issues/3758,
  https://github.com/fmtlib/fmt/issues/3772,
  https://github.com/fmtlib/fmt/pull/3906,
  https://github.com/fmtlib/fmt/pull/3913). For example:

  ```c++
  #include <fmt/chrono.h>
  #include <fmt/color.h>

  int main() {
    fmt::print(fg(fmt::color::green), "{}\n", std::chrono::day(7));
  }
  ```

  prints a green day:

  <img width="306" alt="image" src="https://github.com/fmtlib/fmt/assets/576385/6e395f8b-451a-4cf7-bccc-ee92ca0dec65">

  Thanks @zivshek.

- Fixed handling of precision in `%S` (https://github.com/fmtlib/fmt/issues/3794,
  https://github.com/fmtlib/fmt/pull/3814). Thanks @js324.

- Added support for the `-` specifier (glibc `strftime` extension) to day of
  the month (`%d`) and week of the year (`%W`, `%U`, `%V`) specifiers
  (https://github.com/fmtlib/fmt/pull/3976). Thanks @ZaheenJ.

- Fixed the scope of the `-` extension in chrono formatting so that it doesn't
  apply to subsequent specifiers (https://github.com/fmtlib/fmt/issues/3811,
  https://github.com/fmtlib/fmt/pull/3812). Thanks @phprus.

- Improved handling of `time_point::min()`
  (https://github.com/fmtlib/fmt/issues/3282).

- Added support for character range formatting
  (https://github.com/fmtlib/fmt/issues/3857,
  https://github.com/fmtlib/fmt/pull/3863). Thanks @js324.

- Added `string` and `debug_string` range formatters
  (https://github.com/fmtlib/fmt/pull/3973). Thanks @matt77hias.

- Enabled ADL for `begin` and `end` in `fmt::join`
  (https://github.com/fmtlib/fmt/issues/3813,
  https://github.com/fmtlib/fmt/pull/3824). Thanks @bbolli.

- Made contiguous iterator optimizations apply to `std::basic_string` iterators
  (https://github.com/fmtlib/fmt/pull/3798). Thanks @phprus.

- Added support for ranges with mutable `begin` and `end`
  (https://github.com/fmtlib/fmt/issues/3752,
  https://github.com/fmtlib/fmt/pull/3800,
  https://github.com/fmtlib/fmt/pull/3955). Thanks @tcbrindle and @Arghnews.

- Added support for move-only iterators to `fmt::join`
  (https://github.com/fmtlib/fmt/issues/3802,
  https://github.com/fmtlib/fmt/pull/3946). Thanks @Arghnews.

- Moved range and iterator overloads of `fmt::join` to `fmt/ranges.h`, next
  to other overloads.

- Fixed hanling of types with `begin` returning `void` such as Eigen matrices
  (https://github.com/fmtlib/fmt/issues/3839,
  https://github.com/fmtlib/fmt/pull/3964). Thanks @Arghnews.

- Added an `fmt::formattable` concept (https://github.com/fmtlib/fmt/pull/3974).
  Thanks @matt77hias.

- Added support for `__float128` (https://github.com/fmtlib/fmt/issues/3494).

- Fixed rounding issues when formatting `long double` with fixed precision
  (https://github.com/fmtlib/fmt/issues/3539).

- Made `fmt::isnan` not trigger floating-point exception for NaN values
  (https://github.com/fmtlib/fmt/issues/3948,
  https://github.com/fmtlib/fmt/pull/3951). Thanks @alexdewar.

- Removed dependency on `<memory>` for `std::allocator_traits` when possible
  (https://github.com/fmtlib/fmt/pull/3804). Thanks @phprus.

- Enabled compile-time checks in formatting functions that take text colors and
  styles.

- Deprecated wide stream overloads of `fmt::print` that take text styles.

- Made format string compilation work with clang 12 and later despite
  only partial non-type template parameter support
  (https://github.com/fmtlib/fmt/issues/4000,
  https://github.com/fmtlib/fmt/pull/4001). Thanks @yujincheng08.

- Made `fmt::iterator_buffer`'s move constructor `noexcept`
  (https://github.com/fmtlib/fmt/pull/3808). Thanks @waywardmonkeys.

- Started enforcing that `formatter::format` is const for compatibility
  with `std::format` (https://github.com/fmtlib/fmt/issues/3447).

- Added `fmt::basic_format_arg::visit` and deprecated `fmt::visit_format_arg`.

- Made `fmt::basic_string_view` not constructible from `nullptr` for
  consistency with `std::string_view` in C++23
  (https://github.com/fmtlib/fmt/pull/3846). Thanks @dalle.

- Fixed `fmt::group_digits` for negative integers
  (https://github.com/fmtlib/fmt/issues/3891,
  https://github.com/fmtlib/fmt/pull/3901). Thanks @phprus.

- Fixed handling of negative ids in `fmt::basic_format_args::get`
  (https://github.com/fmtlib/fmt/pull/3945). Thanks @marlenecota.

- Improved named argument validation
  (https://github.com/fmtlib/fmt/issues/3817).

- Disabled copy contruction/assignment for `fmt::format_arg_store` and
  fixed moved construction (https://github.com/fmtlib/fmt/pull/3833).
  Thanks @ivafanas.

- Worked around a locale issue in RHEL/devtoolset
  (https://github.com/fmtlib/fmt/issues/3858,
  https://github.com/fmtlib/fmt/pull/3859). Thanks @g199209.

- Added RTTI detection for MSVC (https://github.com/fmtlib/fmt/pull/3821,
  https://github.com/fmtlib/fmt/pull/3963). Thanks @edo9300.

- Migrated the documentation from Sphinx to MkDocs.

- Improved documentation and README
  (https://github.com/fmtlib/fmt/issues/3775,
  https://github.com/fmtlib/fmt/pull/3784,
  https://github.com/fmtlib/fmt/issues/3788,
  https://github.com/fmtlib/fmt/pull/3789,
  https://github.com/fmtlib/fmt/pull/3793,
  https://github.com/fmtlib/fmt/issues/3818,
  https://github.com/fmtlib/fmt/pull/3820,
  https://github.com/fmtlib/fmt/pull/3822,
  https://github.com/fmtlib/fmt/pull/3843,
  https://github.com/fmtlib/fmt/pull/3890,
  https://github.com/fmtlib/fmt/issues/3894,
  https://github.com/fmtlib/fmt/pull/3895,
  https://github.com/fmtlib/fmt/pull/3905,
  https://github.com/fmtlib/fmt/issues/3942,
  https://github.com/fmtlib/fmt/pull/4008).
  Thanks @zencatalyst, WolleTD, @tupaschoal, @Dobiasd, @frank-weinberg, @bbolli,
  @phprus, @waywardmonkeys, @js324 and @tchaikov.

- Improved CI and tests
  (https://github.com/fmtlib/fmt/issues/3878,
  https://github.com/fmtlib/fmt/pull/3883,
  https://github.com/fmtlib/fmt/issues/3897,
  https://github.com/fmtlib/fmt/pull/3979,
  https://github.com/fmtlib/fmt/pull/3980,
  https://github.com/fmtlib/fmt/pull/3988,
  https://github.com/fmtlib/fmt/pull/4010,
  https://github.com/fmtlib/fmt/pull/4012).
  Thanks @vgorrX, @waywardmonkeys, @tchaikov and @phprus.

- Fixed buffer overflow when using format string compilation with debug format
  and `std::back_insert_iterator` (https://github.com/fmtlib/fmt/issues/3795,
  https://github.com/fmtlib/fmt/pull/3797). Thanks @phprus.

- Improved Bazel support
  (https://github.com/fmtlib/fmt/pull/3792,
  https://github.com/fmtlib/fmt/pull/3801,
  https://github.com/fmtlib/fmt/pull/3962,
  https://github.com/fmtlib/fmt/pull/3965). Thanks @Vertexwahn.

- Improved/fixed the CMake config
  (https://github.com/fmtlib/fmt/issues/3777,
  https://github.com/fmtlib/fmt/pull/3783,
  https://github.com/fmtlib/fmt/issues/3847,
  https://github.com/fmtlib/fmt/pull/3907). Thanks @phprus and @xTachyon.

- Fixed various warnings and compilation issues
  (https://github.com/fmtlib/fmt/issues/3685,
  https://github.com/fmtlib/fmt/issues/3769,
  https://github.com/fmtlib/fmt/issues/3796,
  https://github.com/fmtlib/fmt/issues/3803,
  https://github.com/fmtlib/fmt/pull/3806,
  https://github.com/fmtlib/fmt/pull/3807,
  https://github.com/fmtlib/fmt/issues/3809,
  https://github.com/fmtlib/fmt/pull/3810,
  https://github.com/fmtlib/fmt/issues/3830,
  https://github.com/fmtlib/fmt/pull/3832,
  https://github.com/fmtlib/fmt/issues/3835,
  https://github.com/fmtlib/fmt/pull/3844,
  https://github.com/fmtlib/fmt/issues/3854,
  https://github.com/fmtlib/fmt/pull/3856,
  https://github.com/fmtlib/fmt/pull/3865,
  https://github.com/fmtlib/fmt/pull/3866,
  https://github.com/fmtlib/fmt/pull/3880,
  https://github.com/fmtlib/fmt/issues/3881,
  https://github.com/fmtlib/fmt/issues/3884,
  https://github.com/fmtlib/fmt/issues/3898,
  https://github.com/fmtlib/fmt/pull/3899,
  https://github.com/fmtlib/fmt/pull/3909,
  https://github.com/fmtlib/fmt/pull/3917,
  https://github.com/fmtlib/fmt/pull/3923,
  https://github.com/fmtlib/fmt/pull/3924,
  https://github.com/fmtlib/fmt/issues/3925,
  https://github.com/fmtlib/fmt/pull/3930,
  https://github.com/fmtlib/fmt/pull/3931,
  https://github.com/fmtlib/fmt/pull/3933,
  https://github.com/fmtlib/fmt/issues/3935,
  https://github.com/fmtlib/fmt/pull/3937,
  https://github.com/fmtlib/fmt/pull/3967,
  https://github.com/fmtlib/fmt/pull/3968,
  https://github.com/fmtlib/fmt/pull/3972,
  https://github.com/fmtlib/fmt/pull/3983,
  https://github.com/fmtlib/fmt/pull/3995).
  Thanks @hmbj, @phprus, @res2k, @Baardi, @matt77hias, @waywardmonkeys, @hmbj,
  @yakra, @prlw1, @Arghnews, @mtillmann0, @ShifftC, @eepp, @jimmy-park and
  @ChristianGebhardt.

# 10.2.1 - 2024-01-04

- Fixed ABI compatibility with earlier 10.x versions
  (https://github.com/fmtlib/fmt/issues/3785,
  https://github.com/fmtlib/fmt/pull/3786). Thanks @saraedum.

# 10.2.0 - 2024-01-01

- Added support for the `%j` specifier (the number of days) for
  `std::chrono::duration` (https://github.com/fmtlib/fmt/issues/3643,
  https://github.com/fmtlib/fmt/pull/3732). Thanks @intelfx.

- Added support for the chrono suffix for days and changed
  the suffix for minutes from "m" to the correct "min"
  (https://github.com/fmtlib/fmt/issues/3662,
  https://github.com/fmtlib/fmt/pull/3664).
  For example ([godbolt](https://godbolt.org/z/9KhMnq9ba)):

  ```c++
  #include <fmt/chrono.h>

  int main() {
    fmt::print("{}\n", std::chrono::days(42)); // prints "42d"
  }
  ```

  Thanks @Richardk2n.

- Fixed an overflow in `std::chrono::time_point` formatting with large dates
  (https://github.com/fmtlib/fmt/issues/3725,
  https://github.com/fmtlib/fmt/pull/3727). Thanks @cschreib.

- Added a formatter for `std::source_location`
  (https://github.com/fmtlib/fmt/pull/3730).
  For example ([godbolt](https://godbolt.org/z/YajfKjhhr)):

  ```c++
  #include <source_location>
  #include <fmt/std.h>

  int main() {
    fmt::print("{}\n", std::source_location::current());
  }
  ```

  prints

  ```
  /app/example.cpp:5:51: int main()
  ```

  Thanks @felix642.

- Added a formatter for `std::bitset`
  (https://github.com/fmtlib/fmt/pull/3660).
  For example ([godbolt](https://godbolt.org/z/bdEaGeYxe)):

  ```c++
  #include <bitset>
  #include <fmt/std.h>

  int main() {
    fmt::print("{}\n", std::bitset<6>(42)); // prints "101010"
  }
  ```

  Thanks @muggenhor.

- Added an experimental `nested_formatter` that provides an easy way of
  applying a formatter to one or more subobjects while automatically handling
  width, fill and alignment. For example:

  ```c++
  #include <fmt/format.h>

  struct point {
    double x, y;
  };

  template <>
  struct fmt::formatter<point> : nested_formatter<double> {
    auto format(point p, format_context& ctx) const {
      return write_padded(ctx, [=](auto out) {
        return format_to(out, "({}, {})", nested(p.x), nested(p.y));
      });
    }
  };

  int main() {
    fmt::print("[{:>20.2f}]", point{1, 2});
  }
  ```

  prints

  ```
  [          (1.00, 2.00)]
  ```

- Added the generic representation (`g`) to `std::filesystem::path`
  (https://github.com/fmtlib/fmt/issues/3715,
  https://github.com/fmtlib/fmt/pull/3729). For example:

  ```c++
  #include <filesystem>
  #include <fmt/std.h>

  int main() {
    fmt::print("{:g}\n", std::filesystem::path("C:\\foo"));
  }
  ```

  prints `"C:/foo"` on Windows.

  Thanks @js324.

- Made `format_as` work with references
  (https://github.com/fmtlib/fmt/pull/3739). Thanks @tchaikov.

- Fixed formatting of invalid UTF-8 with precision
  (https://github.com/fmtlib/fmt/issues/3284).

- Fixed an inconsistency between `fmt::to_string` and `fmt::format`
  (https://github.com/fmtlib/fmt/issues/3684).

- Disallowed unsafe uses of `fmt::styled`
  (https://github.com/fmtlib/fmt/issues/3625):

  ```c++
  auto s = fmt::styled(std::string("dangle"), fmt::emphasis::bold);
  fmt::print("{}\n", s); // compile error
  ```

  Pass `fmt::styled(...)` as a parameter instead.

- Added a null check when formatting a C string with the `s` specifier
  (https://github.com/fmtlib/fmt/issues/3706).

- Disallowed the `c` specifier for `bool`
  (https://github.com/fmtlib/fmt/issues/3726,
  https://github.com/fmtlib/fmt/pull/3734). Thanks @js324.

- Made the default formatting unlocalized in `fmt::ostream_formatter` for
  consistency with the rest of the library
  (https://github.com/fmtlib/fmt/issues/3460).

- Fixed localized formatting in bases other than decimal
  (https://github.com/fmtlib/fmt/issues/3693,
  https://github.com/fmtlib/fmt/pull/3750). Thanks @js324.

- Fixed a performance regression in experimental `fmt::ostream::print`
  (https://github.com/fmtlib/fmt/issues/3674).

- Added synchronization with the underlying output stream when writing to
  the Windows console
  (https://github.com/fmtlib/fmt/pull/3668,
  https://github.com/fmtlib/fmt/issues/3688,
  https://github.com/fmtlib/fmt/pull/3689).
  Thanks @Roman-Koshelev and @dimztimz.

- Changed to only export `format_error` when {fmt} is built as a shared
  library (https://github.com/fmtlib/fmt/issues/3626,
  https://github.com/fmtlib/fmt/pull/3627). Thanks @phprus.

- Made `fmt::streamed` `constexpr`.
  (https://github.com/fmtlib/fmt/pull/3650). Thanks @muggenhor.

- Enabled `consteval` on older versions of MSVC
  (https://github.com/fmtlib/fmt/pull/3757). Thanks @phprus.

- Added an option to build without `wchar_t` support on Windows
  (https://github.com/fmtlib/fmt/issues/3631,
  https://github.com/fmtlib/fmt/pull/3636). Thanks @glebm.

- Improved build and CI configuration
  (https://github.com/fmtlib/fmt/pull/3679,
  https://github.com/fmtlib/fmt/issues/3701,
  https://github.com/fmtlib/fmt/pull/3702,
  https://github.com/fmtlib/fmt/pull/3749).
  Thanks @jcar87, @pklima and @tchaikov.

- Fixed various warnings, compilation and test issues
  (https://github.com/fmtlib/fmt/issues/3607,
  https://github.com/fmtlib/fmt/pull/3610,
  https://github.com/fmtlib/fmt/pull/3624,
  https://github.com/fmtlib/fmt/pull/3630,
  https://github.com/fmtlib/fmt/pull/3634,
  https://github.com/fmtlib/fmt/pull/3638,
  https://github.com/fmtlib/fmt/issues/3645,
  https://github.com/fmtlib/fmt/issues/3646,
  https://github.com/fmtlib/fmt/pull/3647,
  https://github.com/fmtlib/fmt/pull/3652,
  https://github.com/fmtlib/fmt/issues/3654,
  https://github.com/fmtlib/fmt/pull/3663,
  https://github.com/fmtlib/fmt/issues/3670,
  https://github.com/fmtlib/fmt/pull/3680,
  https://github.com/fmtlib/fmt/issues/3694,
  https://github.com/fmtlib/fmt/pull/3695,
  https://github.com/fmtlib/fmt/pull/3699,
  https://github.com/fmtlib/fmt/issues/3705,
  https://github.com/fmtlib/fmt/issues/3710,
  https://github.com/fmtlib/fmt/issues/3712,
  https://github.com/fmtlib/fmt/pull/3713,
  https://github.com/fmtlib/fmt/issues/3714,
  https://github.com/fmtlib/fmt/pull/3716,
  https://github.com/fmtlib/fmt/pull/3723,
  https://github.com/fmtlib/fmt/issues/3738,
  https://github.com/fmtlib/fmt/issues/3740,
  https://github.com/fmtlib/fmt/pull/3741,
  https://github.com/fmtlib/fmt/pull/3743,
  https://github.com/fmtlib/fmt/issues/3745,
  https://github.com/fmtlib/fmt/pull/3747,
  https://github.com/fmtlib/fmt/pull/3748,
  https://github.com/fmtlib/fmt/pull/3751,
  https://github.com/fmtlib/fmt/pull/3754,
  https://github.com/fmtlib/fmt/pull/3755,
  https://github.com/fmtlib/fmt/issues/3760,
  https://github.com/fmtlib/fmt/pull/3762,
  https://github.com/fmtlib/fmt/issues/3763,
  https://github.com/fmtlib/fmt/pull/3764,
  https://github.com/fmtlib/fmt/issues/3774,
  https://github.com/fmtlib/fmt/pull/3779).
  Thanks @danakj, @vinayyadav3016, @cyyever, @phprus, @qimiko, @saschasc,
  @gsjaardema, @lazka, @Zhaojun-Liu, @carlsmedstad, @hotwatermorning,
  @cptFracassa, @kuguma, @PeterJohnson, @H1X4Dev, @asantoni, @eltociear,
  @msimberg, @tchaikov, @waywardmonkeys.

- Improved documentation and README
  (https://github.com/fmtlib/fmt/issues/2086,
  https://github.com/fmtlib/fmt/issues/3637,
  https://github.com/fmtlib/fmt/pull/3642,
  https://github.com/fmtlib/fmt/pull/3653,
  https://github.com/fmtlib/fmt/pull/3655,
  https://github.com/fmtlib/fmt/pull/3661,
  https://github.com/fmtlib/fmt/issues/3673,
  https://github.com/fmtlib/fmt/pull/3677,
  https://github.com/fmtlib/fmt/pull/3737,
  https://github.com/fmtlib/fmt/issues/3742,
  https://github.com/fmtlib/fmt/pull/3744).
  Thanks @idzm, @perlun, @joycebrum, @fennewald, @reinhardt1053, @GeorgeLS.

- Updated CI dependencies
  (https://github.com/fmtlib/fmt/pull/3615,
  https://github.com/fmtlib/fmt/pull/3622,
  https://github.com/fmtlib/fmt/pull/3623,
  https://github.com/fmtlib/fmt/pull/3666,
  https://github.com/fmtlib/fmt/pull/3696,
  https://github.com/fmtlib/fmt/pull/3697,
  https://github.com/fmtlib/fmt/pull/3759,
  https://github.com/fmtlib/fmt/pull/3782).

# 10.1.1 - 2023-08-28

- Added formatters for `std::atomic` and `atomic_flag`
  (https://github.com/fmtlib/fmt/pull/3574,
  https://github.com/fmtlib/fmt/pull/3594).
  Thanks @wangzw and @AlexGuteniev.
- Fixed an error about partial specialization of `formatter<string>`
  after instantiation when compiled with gcc and C++20
  (https://github.com/fmtlib/fmt/issues/3584).
- Fixed compilation as a C++20 module with gcc and clang
  (https://github.com/fmtlib/fmt/issues/3587,
  https://github.com/fmtlib/fmt/pull/3597,
  https://github.com/fmtlib/fmt/pull/3605).
  Thanks @MathewBensonCode.
- Made `fmt::to_string` work with types that have `format_as`
  overloads (https://github.com/fmtlib/fmt/pull/3575). Thanks @phprus.
- Made `formatted_size` work with integral format specifiers at
  compile time (https://github.com/fmtlib/fmt/pull/3591).
  Thanks @elbeno.
- Fixed a warning about the `no_unique_address` attribute on clang-cl
  (https://github.com/fmtlib/fmt/pull/3599). Thanks @lukester1975.
- Improved compatibility with the legacy GBK encoding
  (https://github.com/fmtlib/fmt/issues/3598,
  https://github.com/fmtlib/fmt/pull/3599). Thanks @YuHuanTin.
- Added OpenSSF Scorecard analysis
  (https://github.com/fmtlib/fmt/issues/3530,
  https://github.com/fmtlib/fmt/pull/3571). Thanks @joycebrum.
- Updated CI dependencies
  (https://github.com/fmtlib/fmt/pull/3591,
  https://github.com/fmtlib/fmt/pull/3592,
  https://github.com/fmtlib/fmt/pull/3593,
  https://github.com/fmtlib/fmt/pull/3602).

# 10.1.0 - 2023-08-12

- Optimized format string compilation resulting in up to 40% speed up
  in compiled `format_to` and \~4x speed up in compiled `format_to_n`
  on a concatenation benchmark
  (https://github.com/fmtlib/fmt/issues/3133,
  https://github.com/fmtlib/fmt/issues/3484).

  {fmt} 10.0:

      ---------------------------------------------------------
      Benchmark               Time             CPU   Iterations
      ---------------------------------------------------------
      BM_format_to         78.9 ns         78.9 ns      8881746
      BM_format_to_n        568 ns          568 ns      1232089

  {fmt} 10.1:

      ---------------------------------------------------------
      Benchmark               Time             CPU   Iterations
      ---------------------------------------------------------
      BM_format_to         54.9 ns         54.9 ns     12727944
      BM_format_to_n        133 ns          133 ns      5257795

- Optimized storage of an empty allocator in `basic_memory_buffer`
  (https://github.com/fmtlib/fmt/pull/3485). Thanks @Minty-Meeo.

- Added formatters for proxy references to elements of
  `std::vector<bool>` and `std::bitset<N>`
  (https://github.com/fmtlib/fmt/issues/3567,
  https://github.com/fmtlib/fmt/pull/3570). For example
  ([godbolt](https://godbolt.org/z/zYb79Pvn8)):

  ```c++
  #include <vector>
  #include <fmt/std.h>

  int main() {
    auto v = std::vector<bool>{true};
    fmt::print("{}", v[0]);
  }
  ```

  Thanks @phprus and @felix642.

- Fixed an ambiguous formatter specialization for containers that look
  like container adaptors such as `boost::flat_set`
  (https://github.com/fmtlib/fmt/issues/3556,
  https://github.com/fmtlib/fmt/pull/3561). Thanks @5chmidti.

- Fixed compilation when formatting durations not convertible from
  `std::chrono::seconds`
  (https://github.com/fmtlib/fmt/pull/3430). Thanks @patlkli.

- Made the `formatter` specialization for `char*` const-correct
  (https://github.com/fmtlib/fmt/pull/3432). Thanks @timsong-cpp.

- Made `{}` and `{:}` handled consistently during compile-time checks
  (https://github.com/fmtlib/fmt/issues/3526).

- Disallowed passing temporaries to `make_format_args` to improve API
  safety by preventing dangling references.

- Improved the compile-time error for unformattable types
  (https://github.com/fmtlib/fmt/pull/3478). Thanks @BRevzin.

- Improved the floating-point formatter
  (https://github.com/fmtlib/fmt/pull/3448,
  https://github.com/fmtlib/fmt/pull/3450).
  Thanks @florimond-collette.

- Fixed handling of precision for `long double` larger than 64 bits.
  (https://github.com/fmtlib/fmt/issues/3539,
  https://github.com/fmtlib/fmt/issues/3564).

- Made floating-point and chrono tests less platform-dependent
  (https://github.com/fmtlib/fmt/issues/3337,
  https://github.com/fmtlib/fmt/issues/3433,
  https://github.com/fmtlib/fmt/pull/3434). Thanks @phprus.

- Removed the remnants of the Grisu floating-point formatter that has
  been replaced by Dragonbox in earlier versions.

- Added `throw_format_error` to the public API
  (https://github.com/fmtlib/fmt/pull/3551). Thanks @mjerabek.

- Made `FMT_THROW` assert even if assertions are disabled when
  compiling with exceptions disabled
  (https://github.com/fmtlib/fmt/issues/3418,
  https://github.com/fmtlib/fmt/pull/3439). Thanks @BRevzin.

- Made `format_as` and `std::filesystem::path` formatter work with
  exotic code unit types.
  (https://github.com/fmtlib/fmt/pull/3457,
  https://github.com/fmtlib/fmt/pull/3476). Thanks @gix and @hmbj.

- Added support for the `?` format specifier to
  `std::filesystem::path` and made the default unescaped for
  consistency with strings.

- Deprecated the wide stream overload of `printf`.

- Removed unused `basic_printf_parse_context`.

- Improved RTTI detection used when formatting exceptions
  (https://github.com/fmtlib/fmt/pull/3468). Thanks @danakj.

- Improved compatibility with VxWorks7
  (https://github.com/fmtlib/fmt/pull/3467). Thanks @wenshan1.

- Improved documentation
  (https://github.com/fmtlib/fmt/issues/3174,
  https://github.com/fmtlib/fmt/issues/3423,
  https://github.com/fmtlib/fmt/pull/3454,
  https://github.com/fmtlib/fmt/issues/3458,
  https://github.com/fmtlib/fmt/pull/3461,
  https://github.com/fmtlib/fmt/issues/3487,
  https://github.com/fmtlib/fmt/pull/3515).
  Thanks @zencatalyst, @rlalik and @mikecrowe.

- Improved build and CI configurations
  (https://github.com/fmtlib/fmt/issues/3449,
  https://github.com/fmtlib/fmt/pull/3451,
  https://github.com/fmtlib/fmt/pull/3452,
  https://github.com/fmtlib/fmt/pull/3453,
  https://github.com/fmtlib/fmt/pull/3459,
  https://github.com/fmtlib/fmt/issues/3481,
  https://github.com/fmtlib/fmt/pull/3486,
  https://github.com/fmtlib/fmt/issues/3489,
  https://github.com/fmtlib/fmt/pull/3496,
  https://github.com/fmtlib/fmt/issues/3517,
  https://github.com/fmtlib/fmt/pull/3523,
  https://github.com/fmtlib/fmt/pull/3563).
  Thanks @joycebrum, @glebm, @phprus, @petrmanek, @setoye and @abouvier.

- Fixed various warnings and compilation issues
  (https://github.com/fmtlib/fmt/issues/3408,
  https://github.com/fmtlib/fmt/issues/3424,
  https://github.com/fmtlib/fmt/issues/3444,
  https://github.com/fmtlib/fmt/pull/3446,
  https://github.com/fmtlib/fmt/pull/3475,
  https://github.com/fmtlib/fmt/pull/3482,
  https://github.com/fmtlib/fmt/issues/3492,
  https://github.com/fmtlib/fmt/pull/3493,
  https://github.com/fmtlib/fmt/pull/3508,
  https://github.com/fmtlib/fmt/issues/3509,
  https://github.com/fmtlib/fmt/issues/3533,
  https://github.com/fmtlib/fmt/pull/3542,
  https://github.com/fmtlib/fmt/issues/3543,
  https://github.com/fmtlib/fmt/issues/3540,
  https://github.com/fmtlib/fmt/pull/3544,
  https://github.com/fmtlib/fmt/issues/3548,
  https://github.com/fmtlib/fmt/pull/3549,
  https://github.com/fmtlib/fmt/pull/3550,
  https://github.com/fmtlib/fmt/pull/3552).
  Thanks @adesitter, @hmbj, @Minty-Meeo, @phprus, @TobiSchluter,
  @kieranclancy, @alexeedm, @jurihock, @Ozomahtli and @razaqq.

# 10.0.0 - 2023-05-09

- Replaced Grisu with a new floating-point formatting algorithm for
  given precision (https://github.com/fmtlib/fmt/issues/3262,
  https://github.com/fmtlib/fmt/issues/2750,
  https://github.com/fmtlib/fmt/pull/3269,
  https://github.com/fmtlib/fmt/pull/3276). The new algorithm
  is based on Dragonbox already used for the shortest representation
  and gives substantial performance improvement:

  ![](https://user-images.githubusercontent.com/33922675/211956670-84891a09-6867-47d9-82fc-3230da7abe0f.png)

  -   Red: new algorithm
  -   Green: new algorithm with `FMT_USE_FULL_CACHE_DRAGONBOX` defined
      to 1
  -   Blue: old algorithm

  Thanks @jk-jeon.

- Replaced `snprintf`-based hex float formatter with an internal
  implementation (https://github.com/fmtlib/fmt/pull/3179,
  https://github.com/fmtlib/fmt/pull/3203). This removes the
  last usage of `s(n)printf` in {fmt}. Thanks @phprus.

- Fixed alignment of floating-point numbers with localization
  (https://github.com/fmtlib/fmt/issues/3263,
  https://github.com/fmtlib/fmt/pull/3272). Thanks @ShawnZhong.

- Made handling of `#` consistent with `std::format`.

- Improved C++20 module support
  (https://github.com/fmtlib/fmt/pull/3134,
  https://github.com/fmtlib/fmt/pull/3254,
  https://github.com/fmtlib/fmt/pull/3386,
  https://github.com/fmtlib/fmt/pull/3387,
  https://github.com/fmtlib/fmt/pull/3388,
  https://github.com/fmtlib/fmt/pull/3392,
  https://github.com/fmtlib/fmt/pull/3397,
  https://github.com/fmtlib/fmt/pull/3399,
  https://github.com/fmtlib/fmt/pull/3400).
  Thanks @laitingsheng, @Orvid and @DanielaE.
  
- Switched to the [modules CMake library](https://github.com/vitaut/modules)
  which allows building {fmt} as a C++20 module with clang:

      CXX=clang++ cmake -DFMT_MODULE=ON .
      make

- Made `format_as` work with any user-defined type and not just enums.
  For example ([godbolt](https://godbolt.org/z/b7rqhq5Kh)):

  ```c++
  #include <fmt/format.h>

  struct floaty_mc_floatface {
    double value;
  };

  auto format_as(floaty_mc_floatface f) { return f.value; }

  int main() {
    fmt::print("{:8}\n", floaty_mc_floatface{0.42}); // prints "    0.42"
  }
  ```

- Removed deprecated implicit conversions for enums and conversions to
  primitive types for compatibility with `std::format` and to prevent
  potential ODR violations. Use `format_as` instead.

- Added support for fill, align and width to the time point formatter
  (https://github.com/fmtlib/fmt/issues/3237,
  https://github.com/fmtlib/fmt/pull/3260,
  https://github.com/fmtlib/fmt/pull/3275). For example
  ([godbolt](https://godbolt.org/z/rKP6MGz6c)):

  ```c++
  #include <fmt/chrono.h>

  int main() {
    // prints "    2023"
    fmt::print("{:>8%Y}\n", std::chrono::system_clock::now());
  }
  ```

  Thanks @ShawnZhong.

- Implemented formatting of subseconds
  (https://github.com/fmtlib/fmt/issues/2207,
  https://github.com/fmtlib/fmt/issues/3117,
  https://github.com/fmtlib/fmt/pull/3115,
  https://github.com/fmtlib/fmt/pull/3143,
  https://github.com/fmtlib/fmt/pull/3144,
  https://github.com/fmtlib/fmt/pull/3349). For example
  ([godbolt](https://godbolt.org/z/45738oGEo)):

  ```c++
  #include <fmt/chrono.h>

  int main() {
    // prints 01.234567
    fmt::print("{:%S}\n", std::chrono::microseconds(1234567));
  }
  ```

  Thanks @patrickroocks @phprus and @BRevzin.

- Added precision support to `%S`
  (https://github.com/fmtlib/fmt/pull/3148). Thanks @SappyJoy

- Added support for `std::utc_time`
  (https://github.com/fmtlib/fmt/issues/3098,
  https://github.com/fmtlib/fmt/pull/3110). Thanks @patrickroocks.

- Switched formatting of `std::chrono::system_clock` from local time
  to UTC for compatibility with the standard
  (https://github.com/fmtlib/fmt/issues/3199,
  https://github.com/fmtlib/fmt/pull/3230). Thanks @ned14.

- Added support for `%Ez` and `%Oz` to chrono formatters.
  (https://github.com/fmtlib/fmt/issues/3220,
  https://github.com/fmtlib/fmt/pull/3222). Thanks @phprus.

- Improved validation of format specifiers for `std::chrono::duration`
  (https://github.com/fmtlib/fmt/issues/3219,
  https://github.com/fmtlib/fmt/pull/3232). Thanks @ShawnZhong.

- Fixed formatting of time points before the epoch
  (https://github.com/fmtlib/fmt/issues/3117,
  https://github.com/fmtlib/fmt/pull/3261). For example
  ([godbolt](https://godbolt.org/z/f7bcznb3W)):

  ```c++
  #include <fmt/chrono.h>

  int main() {
    auto t = std::chrono::system_clock::from_time_t(0) -
             std::chrono::milliseconds(250);
    fmt::print("{:%S}\n", t); // prints 59.750000000
  }
  ```

  Thanks @ShawnZhong.

- Experimental: implemented glibc extension for padding seconds,
  minutes and hours
  (https://github.com/fmtlib/fmt/issues/2959,
  https://github.com/fmtlib/fmt/pull/3271). Thanks @ShawnZhong.

- Added a formatter for `std::exception`
  (https://github.com/fmtlib/fmt/issues/2977,
  https://github.com/fmtlib/fmt/issues/3012,
  https://github.com/fmtlib/fmt/pull/3062,
  https://github.com/fmtlib/fmt/pull/3076,
  https://github.com/fmtlib/fmt/pull/3119). For example
  ([godbolt](https://godbolt.org/z/8xoWGs9e4)):

  ```c++
  #include <fmt/std.h>
  #include <vector>

  int main() {
    try {
      std::vector<bool>().at(0);
    } catch(const std::exception& e) {
      fmt::print("{}", e);
    }
  }
  ```

  prints:

      vector<bool>::_M_range_check: __n (which is 0) >= this->size() (which is 0)

  on libstdc++. Thanks @zach2good and @phprus.

- Moved `std::error_code` formatter from `fmt/os.h` to `fmt/std.h`.
  (https://github.com/fmtlib/fmt/pull/3125). Thanks @phprus.

- Added formatters for standard container adapters:
  `std::priority_queue`, `std::queue` and `std::stack`
  (https://github.com/fmtlib/fmt/issues/3215,
  https://github.com/fmtlib/fmt/pull/3279). For example
  ([godbolt](https://godbolt.org/z/74h1xY9qK)):

  ```c++
  #include <fmt/ranges.h>
  #include <stack>
  #include <vector>

  int main() {
    auto s = std::stack<bool, std::vector<bool>>();
    for (auto b: {true, false, true}) s.push(b);
    fmt::print("{}\n", s); // prints [true, false, true]
  }
  ```

  Thanks @ShawnZhong.

- Added a formatter for `std::optional` to `fmt/std.h`
  (https://github.com/fmtlib/fmt/issues/1367,
  https://github.com/fmtlib/fmt/pull/3303).
  Thanks @tom-huntington.

- Fixed formatting of valueless by exception variants
  (https://github.com/fmtlib/fmt/pull/3347). Thanks @TheOmegaCarrot.

- Made `fmt::ptr` accept `unique_ptr` with a custom deleter
  (https://github.com/fmtlib/fmt/pull/3177). Thanks @hmbj.

- Fixed formatting of noncopyable ranges and nested ranges of chars
  (https://github.com/fmtlib/fmt/pull/3158
  https://github.com/fmtlib/fmt/issues/3286,
  https://github.com/fmtlib/fmt/pull/3290). Thanks @BRevzin.

- Fixed issues with formatting of paths and ranges of paths
  (https://github.com/fmtlib/fmt/issues/3319,
  https://github.com/fmtlib/fmt/pull/3321
  https://github.com/fmtlib/fmt/issues/3322). Thanks @phprus.

- Improved handling of invalid Unicode in paths.

- Enabled compile-time checks on Apple clang 14 and later
  (https://github.com/fmtlib/fmt/pull/3331). Thanks @cloyce.

- Improved compile-time checks of named arguments
  (https://github.com/fmtlib/fmt/issues/3105,
  https://github.com/fmtlib/fmt/pull/3214). Thanks @rbrich.

- Fixed formatting when both alignment and `0` are given
  (https://github.com/fmtlib/fmt/issues/3236,
  https://github.com/fmtlib/fmt/pull/3248). Thanks @ShawnZhong.

- Improved Unicode support in the experimental file API on Windows
  (https://github.com/fmtlib/fmt/issues/3234,
  https://github.com/fmtlib/fmt/pull/3293). Thanks @Fros1er.

- Unified UTF transcoding
  (https://github.com/fmtlib/fmt/pull/3416). Thanks @phprus.

- Added support for UTF-8 digit separators via an experimental locale
  facet (https://github.com/fmtlib/fmt/issues/1861). For
  example ([godbolt](https://godbolt.org/z/f7bcznb3W)):

  ```c++
  auto loc = std::locale(
    std::locale(), new fmt::format_facet<std::locale>("’"));
  auto s = fmt::format(loc, "{:L}", 1000);
  ```

  where `’` is U+2019 used as a digit separator in the de_CH locale.

- Added an overload of `formatted_size` that takes a locale
  (https://github.com/fmtlib/fmt/issues/3084,
  https://github.com/fmtlib/fmt/pull/3087). Thanks @gerboengels.

- Removed the deprecated `FMT_DEPRECATED_OSTREAM`.

- Fixed a UB when using a null `std::string_view` with
  `fmt::to_string` or format string compilation
  (https://github.com/fmtlib/fmt/issues/3241,
  https://github.com/fmtlib/fmt/pull/3244). Thanks @phprus.

- Added `starts_with` to the fallback `string_view` implementation
  (https://github.com/fmtlib/fmt/pull/3080). Thanks @phprus.

- Added `fmt::basic_format_string::get()` for compatibility with
  `basic_format_string`
  (https://github.com/fmtlib/fmt/pull/3111). Thanks @huangqinjin.

- Added `println` for compatibility with C++23
  (https://github.com/fmtlib/fmt/pull/3267). Thanks @ShawnZhong.

- Renamed the `FMT_EXPORT` macro for shared library usage to
  `FMT_LIB_EXPORT`.

- Improved documentation
  (https://github.com/fmtlib/fmt/issues/3108,
  https://github.com/fmtlib/fmt/issues/3169,
  https://github.com/fmtlib/fmt/pull/3243).
  https://github.com/fmtlib/fmt/pull/3404,
  https://github.com/fmtlib/fmt/pull/4002).
  Thanks @Cleroth, @Vertexwahn and @yujincheng08.

- Improved build configuration and tests
  (https://github.com/fmtlib/fmt/pull/3118,
  https://github.com/fmtlib/fmt/pull/3120,
  https://github.com/fmtlib/fmt/pull/3188,
  https://github.com/fmtlib/fmt/issues/3189,
  https://github.com/fmtlib/fmt/pull/3198,
  https://github.com/fmtlib/fmt/pull/3205,
  https://github.com/fmtlib/fmt/pull/3207,
  https://github.com/fmtlib/fmt/pull/3210,
  https://github.com/fmtlib/fmt/pull/3240,
  https://github.com/fmtlib/fmt/pull/3256,
  https://github.com/fmtlib/fmt/pull/3264,
  https://github.com/fmtlib/fmt/issues/3299,
  https://github.com/fmtlib/fmt/pull/3302,
  https://github.com/fmtlib/fmt/pull/3312,
  https://github.com/fmtlib/fmt/issues/3317,
  https://github.com/fmtlib/fmt/pull/3328,
  https://github.com/fmtlib/fmt/pull/3333,
  https://github.com/fmtlib/fmt/pull/3369,
  https://github.com/fmtlib/fmt/issues/3373,
  https://github.com/fmtlib/fmt/pull/3395,
  https://github.com/fmtlib/fmt/pull/3406,
  https://github.com/fmtlib/fmt/pull/3411).
  Thanks @dimztimz, @phprus, @DavidKorczynski, @ChrisThrasher,
  @FrancoisCarouge, @kennyweiss, @luzpaz, @codeinred, @Mixaill, @joycebrum,
  @kevinhwang and @Vertexwahn.

- Fixed a regression in handling empty format specifiers after a colon
  (`{:}`) (https://github.com/fmtlib/fmt/pull/3086). Thanks @oxidase.

- Worked around a broken implementation of
  `std::is_constant_evaluated` in some versions of libstdc++ on clang
  (https://github.com/fmtlib/fmt/issues/3247,
  https://github.com/fmtlib/fmt/pull/3281). Thanks @phprus.

- Fixed formatting of volatile variables
  (https://github.com/fmtlib/fmt/pull/3068).

- Fixed various warnings and compilation issues
  (https://github.com/fmtlib/fmt/pull/3057,
  https://github.com/fmtlib/fmt/pull/3066,
  https://github.com/fmtlib/fmt/pull/3072,
  https://github.com/fmtlib/fmt/pull/3082,
  https://github.com/fmtlib/fmt/pull/3091,
  https://github.com/fmtlib/fmt/issues/3092,
  https://github.com/fmtlib/fmt/pull/3093,
  https://github.com/fmtlib/fmt/pull/3095,
  https://github.com/fmtlib/fmt/issues/3096,
  https://github.com/fmtlib/fmt/pull/3097,
  https://github.com/fmtlib/fmt/issues/3128,
  https://github.com/fmtlib/fmt/pull/3129,
  https://github.com/fmtlib/fmt/pull/3137,
  https://github.com/fmtlib/fmt/pull/3139,
  https://github.com/fmtlib/fmt/issues/3140,
  https://github.com/fmtlib/fmt/pull/3142,
  https://github.com/fmtlib/fmt/issues/3149,
  https://github.com/fmtlib/fmt/pull/3150,
  https://github.com/fmtlib/fmt/issues/3154,
  https://github.com/fmtlib/fmt/issues/3163,
  https://github.com/fmtlib/fmt/issues/3178,
  https://github.com/fmtlib/fmt/pull/3184,
  https://github.com/fmtlib/fmt/pull/3196,
  https://github.com/fmtlib/fmt/issues/3204,
  https://github.com/fmtlib/fmt/pull/3206,
  https://github.com/fmtlib/fmt/pull/3208,
  https://github.com/fmtlib/fmt/issues/3213,
  https://github.com/fmtlib/fmt/pull/3216,
  https://github.com/fmtlib/fmt/issues/3224,
  https://github.com/fmtlib/fmt/issues/3226,
  https://github.com/fmtlib/fmt/issues/3228,
  https://github.com/fmtlib/fmt/pull/3229,
  https://github.com/fmtlib/fmt/pull/3259,
  https://github.com/fmtlib/fmt/issues/3274,
  https://github.com/fmtlib/fmt/issues/3287,
  https://github.com/fmtlib/fmt/pull/3288,
  https://github.com/fmtlib/fmt/issues/3292,
  https://github.com/fmtlib/fmt/pull/3295,
  https://github.com/fmtlib/fmt/pull/3296,
  https://github.com/fmtlib/fmt/issues/3298,
  https://github.com/fmtlib/fmt/issues/3325,
  https://github.com/fmtlib/fmt/pull/3326,
  https://github.com/fmtlib/fmt/issues/3334,
  https://github.com/fmtlib/fmt/issues/3342,
  https://github.com/fmtlib/fmt/pull/3343,
  https://github.com/fmtlib/fmt/issues/3351,
  https://github.com/fmtlib/fmt/pull/3352,
  https://github.com/fmtlib/fmt/pull/3362,
  https://github.com/fmtlib/fmt/issues/3365,
  https://github.com/fmtlib/fmt/pull/3366,
  https://github.com/fmtlib/fmt/pull/3374,
  https://github.com/fmtlib/fmt/issues/3377,
  https://github.com/fmtlib/fmt/pull/3378,
  https://github.com/fmtlib/fmt/issues/3381,
  https://github.com/fmtlib/fmt/pull/3398,
  https://github.com/fmtlib/fmt/pull/3413,
  https://github.com/fmtlib/fmt/issues/3415).
  Thanks @phprus, @gsjaardema, @NewbieOrange, @EngineLessCC, @asmaloney,
  @HazardyKnusperkeks, @sergiud, @Youw, @thesmurph, @czudziakm,
  @Roman-Koshelev, @chronoxor, @ShawnZhong, @russelltg, @glebm, @tmartin-gh,
  @Zhaojun-Liu, @louiswins and @mogemimi.

# 9.1.0 - 2022-08-27

- `fmt::formatted_size` now works at compile time
  (https://github.com/fmtlib/fmt/pull/3026). For example
  ([godbolt](https://godbolt.org/z/1MW5rMdf8)):

  ```c++
  #include <fmt/compile.h>

  int main() {
    using namespace fmt::literals;
    constexpr size_t n = fmt::formatted_size("{}"_cf, 42);
    fmt::print("{}\n", n); // prints 2
  }
  ```

  Thanks @marksantaniello.

- Fixed handling of invalid UTF-8
  (https://github.com/fmtlib/fmt/pull/3038,
  https://github.com/fmtlib/fmt/pull/3044,
  https://github.com/fmtlib/fmt/pull/3056).
  Thanks @phprus and @skeeto.

- Improved Unicode support in `ostream` overloads of `print`
  (https://github.com/fmtlib/fmt/pull/2994,
  https://github.com/fmtlib/fmt/pull/3001,
  https://github.com/fmtlib/fmt/pull/3025). Thanks @dimztimz.

- Fixed handling of the sign specifier in localized formatting on
  systems with 32-bit `wchar_t`
  (https://github.com/fmtlib/fmt/issues/3041).

- Added support for wide streams to `fmt::streamed`
  (https://github.com/fmtlib/fmt/pull/2994). Thanks @phprus.

- Added the `n` specifier that disables the output of delimiters when
  formatting ranges (https://github.com/fmtlib/fmt/pull/2981,
  https://github.com/fmtlib/fmt/pull/2983). For example
  ([godbolt](https://godbolt.org/z/roKqGdj8c)):

  ```c++
  #include <fmt/ranges.h>
  #include <vector>

  int main() {
    auto v = std::vector{1, 2, 3};
    fmt::print("{:n}\n", v); // prints 1, 2, 3
  }
  ```

  Thanks @BRevzin.

- Worked around problematic `std::string_view` constructors introduced
  in C++23 (https://github.com/fmtlib/fmt/issues/3030,
  https://github.com/fmtlib/fmt/issues/3050). Thanks @strega-nil-ms.

- Improve handling (exclusion) of recursive ranges
  (https://github.com/fmtlib/fmt/issues/2968,
  https://github.com/fmtlib/fmt/pull/2974). Thanks @Dani-Hub.

- Improved error reporting in format string compilation
  (https://github.com/fmtlib/fmt/issues/3055).

- Improved the implementation of
  [Dragonbox](https://github.com/jk-jeon/dragonbox), the algorithm
  used for the default floating-point formatting
  (https://github.com/fmtlib/fmt/pull/2984). Thanks @jk-jeon.

- Fixed issues with floating-point formatting on exotic platforms.

- Improved the implementation of chrono formatting
  (https://github.com/fmtlib/fmt/pull/3010). Thanks @phprus.

- Improved documentation
  (https://github.com/fmtlib/fmt/pull/2966,
  https://github.com/fmtlib/fmt/pull/3009,
  https://github.com/fmtlib/fmt/issues/3020,
  https://github.com/fmtlib/fmt/pull/3037).
  Thanks @mwinterb, @jcelerier and @remiburtin.

- Improved build configuration
  (https://github.com/fmtlib/fmt/pull/2991,
  https://github.com/fmtlib/fmt/pull/2995,
  https://github.com/fmtlib/fmt/issues/3004,
  https://github.com/fmtlib/fmt/pull/3007,
  https://github.com/fmtlib/fmt/pull/3040).
  Thanks @dimztimz and @hwhsu1231.

- Fixed various warnings and compilation issues
  (https://github.com/fmtlib/fmt/issues/2969,
  https://github.com/fmtlib/fmt/pull/2971,
  https://github.com/fmtlib/fmt/issues/2975,
  https://github.com/fmtlib/fmt/pull/2982,
  https://github.com/fmtlib/fmt/pull/2985,
  https://github.com/fmtlib/fmt/issues/2988,
  https://github.com/fmtlib/fmt/issues/2989,
  https://github.com/fmtlib/fmt/issues/3000,
  https://github.com/fmtlib/fmt/issues/3006,
  https://github.com/fmtlib/fmt/issues/3014,
  https://github.com/fmtlib/fmt/issues/3015,
  https://github.com/fmtlib/fmt/pull/3021,
  https://github.com/fmtlib/fmt/issues/3023,
  https://github.com/fmtlib/fmt/pull/3024,
  https://github.com/fmtlib/fmt/pull/3029,
  https://github.com/fmtlib/fmt/pull/3043,
  https://github.com/fmtlib/fmt/issues/3052,
  https://github.com/fmtlib/fmt/pull/3053,
  https://github.com/fmtlib/fmt/pull/3054).
  Thanks @h-friederich, @dimztimz, @olupton, @bernhardmgruber and @phprus.

# 9.0.0 - 2022-07-04

- Switched to the internal floating point formatter for all decimal
  presentation formats. In particular this results in consistent
  rounding on all platforms and removing the `s[n]printf` fallback for
  decimal FP formatting.

- Compile-time floating point formatting no longer requires the
  header-only mode. For example
  ([godbolt](https://godbolt.org/z/G37PTeG3b)):

  ```c++
  #include <array>
  #include <fmt/compile.h>

  consteval auto compile_time_dtoa(double value) -> std::array<char, 10> {
    auto result = std::array<char, 10>();
    fmt::format_to(result.data(), FMT_COMPILE("{}"), value);
    return result;
  }

  constexpr auto answer = compile_time_dtoa(0.42);
  ```

  works with the default settings.

- Improved the implementation of
  [Dragonbox](https://github.com/jk-jeon/dragonbox), the algorithm
  used for the default floating-point formatting
  (https://github.com/fmtlib/fmt/pull/2713,
  https://github.com/fmtlib/fmt/pull/2750). Thanks @jk-jeon.

- Made `fmt::to_string` work with `__float128`. This uses the internal
  FP formatter and works even on system without `__float128` support
  in `[s]printf`.

- Disabled automatic `std::ostream` insertion operator (`operator<<`)
  discovery when `fmt/ostream.h` is included to prevent ODR
  violations. You can get the old behavior by defining
  `FMT_DEPRECATED_OSTREAM` but this will be removed in the next major
  release. Use `fmt::streamed` or `fmt::ostream_formatter` to enable
  formatting via `std::ostream` instead.

- Added `fmt::ostream_formatter` that can be used to write `formatter`
  specializations that perform formatting via `std::ostream`. For
  example ([godbolt](https://godbolt.org/z/5sEc5qMsf)):

  ```c++
  #include <fmt/ostream.h>

  struct date {
    int year, month, day;

    friend std::ostream& operator<<(std::ostream& os, const date& d) {
      return os << d.year << '-' << d.month << '-' << d.day;
    }
  };

  template <> struct fmt::formatter<date> : ostream_formatter {};

  std::string s = fmt::format("The date is {}", date{2012, 12, 9});
  // s == "The date is 2012-12-9"
  ```

- Added the `fmt::streamed` function that takes an object and formats
  it via `std::ostream`. For example
  ([godbolt](https://godbolt.org/z/5G3346G1f)):

  ```c++
  #include <thread>
  #include <fmt/ostream.h>

  int main() {
    fmt::print("Current thread id: {}\n",
               fmt::streamed(std::this_thread::get_id()));
  }
  ```

  Note that `fmt/std.h` provides a `formatter` specialization for
  `std::thread::id` so you don\'t need to format it via
  `std::ostream`.

- Deprecated implicit conversions of unscoped enums to integers for
  consistency with scoped enums.

- Added an argument-dependent lookup based `format_as` extension API
  to simplify formatting of enums.

- Added experimental `std::variant` formatting support
  (https://github.com/fmtlib/fmt/pull/2941). For example
  ([godbolt](https://godbolt.org/z/KG9z6cq68)):

  ```c++
  #include <variant>
  #include <fmt/std.h>

  int main() {
    auto v = std::variant<int, std::string>(42);
    fmt::print("{}\n", v);
  }
  ```

  prints:

      variant(42)

  Thanks @jehelset.

- Added experimental `std::filesystem::path` formatting support
  (https://github.com/fmtlib/fmt/issues/2865,
  https://github.com/fmtlib/fmt/pull/2902,
  https://github.com/fmtlib/fmt/issues/2917,
  https://github.com/fmtlib/fmt/pull/2918). For example
  ([godbolt](https://godbolt.org/z/o44dMexEb)):

  ```c++
  #include <filesystem>
  #include <fmt/std.h>

  int main() {
    fmt::print("There is no place like {}.", std::filesystem::path("/home"));
  }
  ```

  prints:

      There is no place like "/home".

  Thanks @phprus.

- Added a `std::thread::id` formatter to `fmt/std.h`. For example
  ([godbolt](https://godbolt.org/z/j1azbYf3E)):

  ```c++
  #include <thread>
  #include <fmt/std.h>

  int main() {
    fmt::print("Current thread id: {}\n", std::this_thread::get_id());
  }
  ```

- Added `fmt::styled` that applies a text style to an individual
  argument (https://github.com/fmtlib/fmt/pull/2793). For
  example ([godbolt](https://godbolt.org/z/vWGW7v5M6)):

  ```c++
  #include <fmt/chrono.h>
  #include <fmt/color.h>

  int main() {
    auto now = std::chrono::system_clock::now();
    fmt::print(
      "[{}] {}: {}\n",
      fmt::styled(now, fmt::emphasis::bold),
      fmt::styled("error", fg(fmt::color::red)),
      "something went wrong");
  }
  ```

  prints

  ![](https://user-images.githubusercontent.com/576385/175071215-12809244-dab0-4005-96d8-7cd911c964d5.png)

  Thanks @rbrugo.

- Made `fmt::print` overload for text styles correctly handle UTF-8
  (https://github.com/fmtlib/fmt/issues/2681,
  https://github.com/fmtlib/fmt/pull/2701). Thanks @AlexGuteniev.

- Fixed Unicode handling when writing to an ostream.

- Added support for nested specifiers to range formatting
  (https://github.com/fmtlib/fmt/pull/2673). For example
  ([godbolt](https://godbolt.org/z/xd3Gj38cf)):

  ```c++
  #include <vector>
  #include <fmt/ranges.h>

  int main() {
    fmt::print("{::#x}\n", std::vector{10, 20, 30});
  }
  ```

  prints `[0xa, 0x14, 0x1e]`.

  Thanks @BRevzin.

- Implemented escaping of wide strings in ranges
  (https://github.com/fmtlib/fmt/pull/2904). Thanks @phprus.

- Added support for ranges with `begin` / `end` found via the
  argument-dependent lookup
  (https://github.com/fmtlib/fmt/pull/2807). Thanks @rbrugo.

- Fixed formatting of certain kinds of ranges of ranges
  (https://github.com/fmtlib/fmt/pull/2787). Thanks @BRevzin.

- Fixed handling of maps with element types other than `std::pair`
  (https://github.com/fmtlib/fmt/pull/2944). Thanks @BrukerJWD.

- Made tuple formatter enabled only if elements are formattable
  (https://github.com/fmtlib/fmt/issues/2939,
  https://github.com/fmtlib/fmt/pull/2940). Thanks @jehelset.

- Made `fmt::join` compatible with format string compilation
  (https://github.com/fmtlib/fmt/issues/2719,
  https://github.com/fmtlib/fmt/pull/2720). Thanks @phprus.

- Made compile-time checks work with named arguments of custom types
  and `std::ostream` `print` overloads
  (https://github.com/fmtlib/fmt/issues/2816,
  https://github.com/fmtlib/fmt/issues/2817,
  https://github.com/fmtlib/fmt/pull/2819). Thanks @timsong-cpp.

- Removed `make_args_checked` because it is no longer needed for
  compile-time checks
  (https://github.com/fmtlib/fmt/pull/2760). Thanks @phprus.

- Removed the following deprecated APIs: `_format`, `arg_join`, the
  `format_to` overload that takes a memory buffer, `[v]fprintf` that
  takes an `ostream`.

- Removed the deprecated implicit conversion of `[const] signed char*`
  and `[const] unsigned char*` to C strings.

- Removed the deprecated `fmt/locale.h`.

- Replaced the deprecated `fileno()` with `descriptor()` in
  `buffered_file`.

- Moved `to_string_view` to the `detail` namespace since it\'s an
  implementation detail.

- Made access mode of a created file consistent with `fopen` by
  setting `S_IWGRP` and `S_IWOTH`
  (https://github.com/fmtlib/fmt/pull/2733). Thanks @arogge.

- Removed a redundant buffer resize when formatting to `std::ostream`
  (https://github.com/fmtlib/fmt/issues/2842,
  https://github.com/fmtlib/fmt/pull/2843). Thanks @jcelerier.

- Made precision computation for strings consistent with width
  (https://github.com/fmtlib/fmt/issues/2888).

- Fixed handling of locale separators in floating point formatting
  (https://github.com/fmtlib/fmt/issues/2830).

- Made sign specifiers work with `__int128_t`
  (https://github.com/fmtlib/fmt/issues/2773).

- Improved support for systems such as CHERI with extra data stored in
  pointers (https://github.com/fmtlib/fmt/pull/2932).
  Thanks @davidchisnall.

- Improved documentation
  (https://github.com/fmtlib/fmt/pull/2706,
  https://github.com/fmtlib/fmt/pull/2712,
  https://github.com/fmtlib/fmt/pull/2789,
  https://github.com/fmtlib/fmt/pull/2803,
  https://github.com/fmtlib/fmt/pull/2805,
  https://github.com/fmtlib/fmt/pull/2815,
  https://github.com/fmtlib/fmt/pull/2924).
  Thanks @BRevzin, @Pokechu22, @setoye, @rtobar, @rbrugo, @anoonD and
  @leha-bot.

- Improved build configuration
  (https://github.com/fmtlib/fmt/pull/2766,
  https://github.com/fmtlib/fmt/pull/2772,
  https://github.com/fmtlib/fmt/pull/2836,
  https://github.com/fmtlib/fmt/pull/2852,
  https://github.com/fmtlib/fmt/pull/2907,
  https://github.com/fmtlib/fmt/pull/2913,
  https://github.com/fmtlib/fmt/pull/2914).
  Thanks @kambala-decapitator, @mattiasljungstrom, @kieselnb, @nathannaveen
  and @Vertexwahn.

- Fixed various warnings and compilation issues
  (https://github.com/fmtlib/fmt/issues/2408,
  https://github.com/fmtlib/fmt/issues/2507,
  https://github.com/fmtlib/fmt/issues/2697,
  https://github.com/fmtlib/fmt/issues/2715,
  https://github.com/fmtlib/fmt/issues/2717,
  https://github.com/fmtlib/fmt/pull/2722,
  https://github.com/fmtlib/fmt/pull/2724,
  https://github.com/fmtlib/fmt/pull/2725,
  https://github.com/fmtlib/fmt/issues/2726,
  https://github.com/fmtlib/fmt/pull/2728,
  https://github.com/fmtlib/fmt/pull/2732,
  https://github.com/fmtlib/fmt/issues/2738,
  https://github.com/fmtlib/fmt/pull/2742,
  https://github.com/fmtlib/fmt/issues/2744,
  https://github.com/fmtlib/fmt/issues/2745,
  https://github.com/fmtlib/fmt/issues/2746,
  https://github.com/fmtlib/fmt/issues/2754,
  https://github.com/fmtlib/fmt/pull/2755,
  https://github.com/fmtlib/fmt/issues/2757,
  https://github.com/fmtlib/fmt/pull/2758,
  https://github.com/fmtlib/fmt/issues/2761,
  https://github.com/fmtlib/fmt/pull/2762,
  https://github.com/fmtlib/fmt/issues/2763,
  https://github.com/fmtlib/fmt/pull/2765,
  https://github.com/fmtlib/fmt/issues/2769,
  https://github.com/fmtlib/fmt/pull/2770,
  https://github.com/fmtlib/fmt/issues/2771,
  https://github.com/fmtlib/fmt/issues/2777,
  https://github.com/fmtlib/fmt/pull/2779,
  https://github.com/fmtlib/fmt/pull/2782,
  https://github.com/fmtlib/fmt/pull/2783,
  https://github.com/fmtlib/fmt/issues/2794,
  https://github.com/fmtlib/fmt/issues/2796,
  https://github.com/fmtlib/fmt/pull/2797,
  https://github.com/fmtlib/fmt/pull/2801,
  https://github.com/fmtlib/fmt/pull/2802,
  https://github.com/fmtlib/fmt/issues/2808,
  https://github.com/fmtlib/fmt/issues/2818,
  https://github.com/fmtlib/fmt/pull/2819,
  https://github.com/fmtlib/fmt/issues/2829,
  https://github.com/fmtlib/fmt/issues/2835,
  https://github.com/fmtlib/fmt/issues/2848,
  https://github.com/fmtlib/fmt/issues/2860,
  https://github.com/fmtlib/fmt/pull/2861,
  https://github.com/fmtlib/fmt/pull/2882,
  https://github.com/fmtlib/fmt/issues/2886,
  https://github.com/fmtlib/fmt/issues/2891,
  https://github.com/fmtlib/fmt/pull/2892,
  https://github.com/fmtlib/fmt/issues/2895,
  https://github.com/fmtlib/fmt/issues/2896,
  https://github.com/fmtlib/fmt/pull/2903,
  https://github.com/fmtlib/fmt/issues/2906,
  https://github.com/fmtlib/fmt/issues/2908,
  https://github.com/fmtlib/fmt/pull/2909,
  https://github.com/fmtlib/fmt/issues/2920,
  https://github.com/fmtlib/fmt/pull/2922,
  https://github.com/fmtlib/fmt/pull/2927,
  https://github.com/fmtlib/fmt/pull/2929,
  https://github.com/fmtlib/fmt/issues/2936,
  https://github.com/fmtlib/fmt/pull/2937,
  https://github.com/fmtlib/fmt/pull/2938,
  https://github.com/fmtlib/fmt/pull/2951,
  https://github.com/fmtlib/fmt/issues/2954,
  https://github.com/fmtlib/fmt/pull/2957,
  https://github.com/fmtlib/fmt/issues/2958,
  https://github.com/fmtlib/fmt/pull/2960).
  Thanks @matrackif @Tobi823, @ivan-volnov, @VasiliPupkin256,
  @federico-busato, @barcharcraz, @jk-jeon, @HazardyKnusperkeks, @dalboris,
  @seanm, @gsjaardema, @timsong-cpp, @seanm, @frithrah, @chronoxor, @Agga,
  @madmaxoft, @JurajX, @phprus and @Dani-Hub.

# 8.1.1 - 2022-01-06

- Restored ABI compatibility with version 8.0.x
  (https://github.com/fmtlib/fmt/issues/2695,
  https://github.com/fmtlib/fmt/pull/2696). Thanks @saraedum.
- Fixed chrono formatting on big endian systems
  (https://github.com/fmtlib/fmt/issues/2698,
  https://github.com/fmtlib/fmt/pull/2699).
  Thanks @phprus and @xvitaly.
- Fixed a linkage error with mingw
  (https://github.com/fmtlib/fmt/issues/2691,
  https://github.com/fmtlib/fmt/pull/2692). Thanks @rbberger.

# 8.1.0 - 2022-01-02

- Optimized chrono formatting
  (https://github.com/fmtlib/fmt/pull/2500,
  https://github.com/fmtlib/fmt/pull/2537,
  https://github.com/fmtlib/fmt/issues/2541,
  https://github.com/fmtlib/fmt/pull/2544,
  https://github.com/fmtlib/fmt/pull/2550,
  https://github.com/fmtlib/fmt/pull/2551,
  https://github.com/fmtlib/fmt/pull/2576,
  https://github.com/fmtlib/fmt/issues/2577,
  https://github.com/fmtlib/fmt/pull/2586,
  https://github.com/fmtlib/fmt/pull/2591,
  https://github.com/fmtlib/fmt/pull/2594,
  https://github.com/fmtlib/fmt/pull/2602,
  https://github.com/fmtlib/fmt/pull/2617,
  https://github.com/fmtlib/fmt/issues/2628,
  https://github.com/fmtlib/fmt/pull/2633,
  https://github.com/fmtlib/fmt/issues/2670,
  https://github.com/fmtlib/fmt/pull/2671).

  Processing of some specifiers such as `%z` and `%Y` is now up to
  10-20 times faster, for example on GCC 11 with libstdc++:

      ----------------------------------------------------------------------------
      Benchmark                                  Before             After
      ----------------------------------------------------------------------------
      FMTFormatter_z                             261 ns             26.3 ns
      FMTFormatterCompile_z                      246 ns             11.6 ns
      FMTFormatter_Y                             263 ns             26.1 ns
      FMTFormatterCompile_Y                      244 ns             10.5 ns
      ----------------------------------------------------------------------------

  Thanks @phprus and @toughengineer.

- Implemented subsecond formatting for chrono durations
  (https://github.com/fmtlib/fmt/pull/2623). For example
  ([godbolt](https://godbolt.org/z/es7vWTETe)):

  ```c++
  #include <fmt/chrono.h>

  int main() {
    fmt::print("{:%S}", std::chrono::milliseconds(1234));
  }
  ```

  prints \"01.234\".

  Thanks @matrackif.

- Fixed handling of precision 0 when formatting chrono durations
  (https://github.com/fmtlib/fmt/issues/2587,
  https://github.com/fmtlib/fmt/pull/2588). Thanks @lukester1975.

- Fixed an overflow on invalid inputs in the `tm` formatter
  (https://github.com/fmtlib/fmt/pull/2564). Thanks @phprus.

- Added `fmt::group_digits` that formats integers with a non-localized
  digit separator (comma) for groups of three digits. For example
  ([godbolt](https://godbolt.org/z/TxGxG9Poq)):

  ```c++
  #include <fmt/format.h>

  int main() {
    fmt::print("{} dollars", fmt::group_digits(1000000));
  }
  ```

  prints \"1,000,000 dollars\".

- Added support for faint, conceal, reverse and blink text styles
  (https://github.com/fmtlib/fmt/pull/2394):

  <https://user-images.githubusercontent.com/576385/147710227-c68f5317-f8fa-42c3-9123-7c4ba3c398cb.mp4>

  Thanks @benit8 and @data-man.

- Added experimental support for compile-time floating point
  formatting (https://github.com/fmtlib/fmt/pull/2426,
  https://github.com/fmtlib/fmt/pull/2470). It is currently
  limited to the header-only mode. Thanks @alexezeder.

- Added UDL-based named argument support to compile-time format string
  checks (https://github.com/fmtlib/fmt/issues/2640,
  https://github.com/fmtlib/fmt/pull/2649). For example
  ([godbolt](https://godbolt.org/z/ohGbbvonv)):

  ```c++
  #include <fmt/format.h>

  int main() {
    using namespace fmt::literals;
    fmt::print("{answer:s}", "answer"_a=42);
  }
  ```

  gives a compile-time error on compilers with C++20 `consteval` and
  non-type template parameter support (gcc 10+) because `s` is not a
  valid format specifier for an integer.

  Thanks @alexezeder.

- Implemented escaping of string range elements. For example
  ([godbolt](https://godbolt.org/z/rKvM1vKf3)):

  ```c++
  #include <fmt/ranges.h>
  #include <vector>

  int main() {
    fmt::print("{}", std::vector<std::string>{"\naan"});
  }
  ```

  is now printed as:

      ["\naan"]

  instead of:

      ["
      aan"]

- Added an experimental `?` specifier for escaping strings.
  (https://github.com/fmtlib/fmt/pull/2674). Thanks @BRevzin.

- Switched to JSON-like representation of maps and sets for
  consistency with Python\'s `str.format`. For example
  ([godbolt](https://godbolt.org/z/seKjoY9W5)):

  ```c++
  #include <fmt/ranges.h>
  #include <map>

  int main() {
    fmt::print("{}", std::map<std::string, int>{{"answer", 42}});
  }
  ```

  is now printed as:

      {"answer": 42}

- Extended `fmt::join` to support C++20-only ranges
  (https://github.com/fmtlib/fmt/pull/2549). Thanks @BRevzin.

- Optimized handling of non-const-iterable ranges and implemented
  initial support for non-const-formattable types.

- Disabled implicit conversions of scoped enums to integers that was
  accidentally introduced in earlier versions
  (https://github.com/fmtlib/fmt/pull/1841).

- Deprecated implicit conversion of `[const] signed char*` and
  `[const] unsigned char*` to C strings.

- Deprecated `_format`, a legacy UDL-based format API
  (https://github.com/fmtlib/fmt/pull/2646). Thanks @alexezeder.

- Marked `format`, `formatted_size` and `to_string` as `[[nodiscard]]`
  (https://github.com/fmtlib/fmt/pull/2612). @0x8000-0000.

- Added missing diagnostic when trying to format function and member
  pointers as well as objects convertible to pointers which is
  explicitly disallowed
  (https://github.com/fmtlib/fmt/issues/2598,
  https://github.com/fmtlib/fmt/pull/2609,
  https://github.com/fmtlib/fmt/pull/2610). Thanks @AlexGuteniev.

- Optimized writing to a contiguous buffer with `format_to_n`
  (https://github.com/fmtlib/fmt/pull/2489). Thanks @Roman-Koshelev.

- Optimized writing to non-`char` buffers
  (https://github.com/fmtlib/fmt/pull/2477). Thanks @Roman-Koshelev.

- Decimal point is now localized when using the `L` specifier.

- Improved floating point formatter implementation
  (https://github.com/fmtlib/fmt/pull/2498,
  https://github.com/fmtlib/fmt/pull/2499). Thanks @Roman-Koshelev.

- Fixed handling of very large precision in fixed format
  (https://github.com/fmtlib/fmt/pull/2616).

- Made a table of cached powers used in FP formatting static
  (https://github.com/fmtlib/fmt/pull/2509). Thanks @jk-jeon.

- Resolved a lookup ambiguity with C++20 format-related functions due
  to ADL (https://github.com/fmtlib/fmt/issues/2639,
  https://github.com/fmtlib/fmt/pull/2641). Thanks @mkurdej.

- Removed unnecessary inline namespace qualification
  (https://github.com/fmtlib/fmt/issues/2642,
  https://github.com/fmtlib/fmt/pull/2643). Thanks @mkurdej.

- Implemented argument forwarding in `format_to_n`
  (https://github.com/fmtlib/fmt/issues/2462,
  https://github.com/fmtlib/fmt/pull/2463). Thanks @owent.

- Fixed handling of implicit conversions in `fmt::to_string` and
  format string compilation
  (https://github.com/fmtlib/fmt/issues/2565).

- Changed the default access mode of files created by
  `fmt::output_file` to `-rw-r--r--` for consistency with `fopen`
  (https://github.com/fmtlib/fmt/issues/2530).

- Make `fmt::ostream::flush` public
  (https://github.com/fmtlib/fmt/issues/2435).

- Improved C++14/17 attribute detection
  (https://github.com/fmtlib/fmt/pull/2615). Thanks @AlexGuteniev.

- Improved `consteval` detection for MSVC
  (https://github.com/fmtlib/fmt/pull/2559). Thanks @DanielaE.

- Improved documentation
  (https://github.com/fmtlib/fmt/issues/2406,
  https://github.com/fmtlib/fmt/pull/2446,
  https://github.com/fmtlib/fmt/issues/2493,
  https://github.com/fmtlib/fmt/issues/2513,
  https://github.com/fmtlib/fmt/pull/2515,
  https://github.com/fmtlib/fmt/issues/2522,
  https://github.com/fmtlib/fmt/pull/2562,
  https://github.com/fmtlib/fmt/pull/2575,
  https://github.com/fmtlib/fmt/pull/2606,
  https://github.com/fmtlib/fmt/pull/2620,
  https://github.com/fmtlib/fmt/issues/2676).
  Thanks @sobolevn, @UnePierre, @zhsj, @phprus, @ericcurtin and @Lounarok.

- Improved fuzzers and added a fuzzer for chrono timepoint formatting
  (https://github.com/fmtlib/fmt/pull/2461,
  https://github.com/fmtlib/fmt/pull/2469). @pauldreik,

- Added the `FMT_SYSTEM_HEADERS` CMake option setting which marks
  {fmt}\'s headers as system. It can be used to suppress warnings
  (https://github.com/fmtlib/fmt/issues/2644,
  https://github.com/fmtlib/fmt/pull/2651). Thanks @alexezeder.

- Added the Bazel build system support
  (https://github.com/fmtlib/fmt/pull/2505,
  https://github.com/fmtlib/fmt/pull/2516). Thanks @Vertexwahn.

- Improved build configuration and tests
  (https://github.com/fmtlib/fmt/issues/2437,
  https://github.com/fmtlib/fmt/pull/2558,
  https://github.com/fmtlib/fmt/pull/2648,
  https://github.com/fmtlib/fmt/pull/2650,
  https://github.com/fmtlib/fmt/pull/2663,
  https://github.com/fmtlib/fmt/pull/2677).
  Thanks @DanielaE, @alexezeder and @phprus.

- Fixed various warnings and compilation issues
  (https://github.com/fmtlib/fmt/pull/2353,
  https://github.com/fmtlib/fmt/pull/2356,
  https://github.com/fmtlib/fmt/pull/2399,
  https://github.com/fmtlib/fmt/issues/2408,
  https://github.com/fmtlib/fmt/pull/2414,
  https://github.com/fmtlib/fmt/pull/2427,
  https://github.com/fmtlib/fmt/pull/2432,
  https://github.com/fmtlib/fmt/pull/2442,
  https://github.com/fmtlib/fmt/pull/2434,
  https://github.com/fmtlib/fmt/issues/2439,
  https://github.com/fmtlib/fmt/pull/2447,
  https://github.com/fmtlib/fmt/pull/2450,
  https://github.com/fmtlib/fmt/issues/2455,
  https://github.com/fmtlib/fmt/issues/2465,
  https://github.com/fmtlib/fmt/issues/2472,
  https://github.com/fmtlib/fmt/issues/2474,
  https://github.com/fmtlib/fmt/pull/2476,
  https://github.com/fmtlib/fmt/issues/2478,
  https://github.com/fmtlib/fmt/issues/2479,
  https://github.com/fmtlib/fmt/issues/2481,
  https://github.com/fmtlib/fmt/pull/2482,
  https://github.com/fmtlib/fmt/pull/2483,
  https://github.com/fmtlib/fmt/issues/2490,
  https://github.com/fmtlib/fmt/pull/2491,
  https://github.com/fmtlib/fmt/pull/2510,
  https://github.com/fmtlib/fmt/pull/2518,
  https://github.com/fmtlib/fmt/issues/2528,
  https://github.com/fmtlib/fmt/pull/2529,
  https://github.com/fmtlib/fmt/pull/2539,
  https://github.com/fmtlib/fmt/issues/2540,
  https://github.com/fmtlib/fmt/pull/2545,
  https://github.com/fmtlib/fmt/pull/2555,
  https://github.com/fmtlib/fmt/issues/2557,
  https://github.com/fmtlib/fmt/issues/2570,
  https://github.com/fmtlib/fmt/pull/2573,
  https://github.com/fmtlib/fmt/pull/2582,
  https://github.com/fmtlib/fmt/issues/2605,
  https://github.com/fmtlib/fmt/pull/2611,
  https://github.com/fmtlib/fmt/pull/2647,
  https://github.com/fmtlib/fmt/issues/2627,
  https://github.com/fmtlib/fmt/pull/2630,
  https://github.com/fmtlib/fmt/issues/2635,
  https://github.com/fmtlib/fmt/issues/2638,
  https://github.com/fmtlib/fmt/issues/2653,
  https://github.com/fmtlib/fmt/issues/2654,
  https://github.com/fmtlib/fmt/issues/2661,
  https://github.com/fmtlib/fmt/pull/2664,
  https://github.com/fmtlib/fmt/pull/2684).
  Thanks @DanielaE, @mwinterb, @cdacamar, @TrebledJ, @bodomartin, @cquammen,
  @white238, @mmarkeloff, @palacaze, @jcelerier, @mborn-adi, @BrukerJWD,
  @spyridon97, @phprus, @oliverlee, @joshessman-llnl, @akohlmey, @timkalu,
  @olupton, @Acretock, @alexezeder, @andrewcorrigan, @lucpelletier and
  @HazardyKnusperkeks.

# 8.0.1 - 2021-07-02

- Fixed the version number in the inline namespace
  (https://github.com/fmtlib/fmt/issues/2374).
- Added a missing presentation type check for `std::string`
  (https://github.com/fmtlib/fmt/issues/2402).
- Fixed a linkage error when mixing code built with clang and gcc
  (https://github.com/fmtlib/fmt/issues/2377).
- Fixed documentation issues
  (https://github.com/fmtlib/fmt/pull/2396,
  https://github.com/fmtlib/fmt/issues/2403,
  https://github.com/fmtlib/fmt/issues/2406). Thanks @mkurdej.
- Removed dead code in FP formatter (
  https://github.com/fmtlib/fmt/pull/2398). Thanks @javierhonduco.
- Fixed various warnings and compilation issues
  (https://github.com/fmtlib/fmt/issues/2351,
  https://github.com/fmtlib/fmt/issues/2359,
  https://github.com/fmtlib/fmt/pull/2365,
  https://github.com/fmtlib/fmt/issues/2368,
  https://github.com/fmtlib/fmt/pull/2370,
  https://github.com/fmtlib/fmt/pull/2376,
  https://github.com/fmtlib/fmt/pull/2381,
  https://github.com/fmtlib/fmt/pull/2382,
  https://github.com/fmtlib/fmt/issues/2386,
  https://github.com/fmtlib/fmt/pull/2389,
  https://github.com/fmtlib/fmt/pull/2395,
  https://github.com/fmtlib/fmt/pull/2397,
  https://github.com/fmtlib/fmt/issues/2400,
  https://github.com/fmtlib/fmt/issues/2401,
  https://github.com/fmtlib/fmt/pull/2407).
  Thanks @zx2c4, @AidanSun05, @mattiasljungstrom, @joemmett, @erengy,
  @patlkli, @gsjaardema and @phprus.

# 8.0.0 - 2021-06-21

- Enabled compile-time format string checks by default. For example
  ([godbolt](https://godbolt.org/z/sMxcohGjz)):

  ```c++
  #include <fmt/core.h>

  int main() {
    fmt::print("{:d}", "I am not a number");
  }
  ```

  gives a compile-time error on compilers with C++20 `consteval`
  support (gcc 10+, clang 11+) because `d` is not a valid format
  specifier for a string.

  To pass a runtime string wrap it in `fmt::runtime`:

  ```c++
  fmt::print(fmt::runtime("{:d}"), "I am not a number");
  ```

- Added compile-time formatting
  (https://github.com/fmtlib/fmt/pull/2019,
  https://github.com/fmtlib/fmt/pull/2044,
  https://github.com/fmtlib/fmt/pull/2056,
  https://github.com/fmtlib/fmt/pull/2072,
  https://github.com/fmtlib/fmt/pull/2075,
  https://github.com/fmtlib/fmt/issues/2078,
  https://github.com/fmtlib/fmt/pull/2129,
  https://github.com/fmtlib/fmt/pull/2326). For example
  ([godbolt](https://godbolt.org/z/Mxx9d89jM)):

  ```c++
  #include <fmt/compile.h>

  consteval auto compile_time_itoa(int value) -> std::array<char, 10> {
    auto result = std::array<char, 10>();
    fmt::format_to(result.data(), FMT_COMPILE("{}"), value);
    return result;
  }

  constexpr auto answer = compile_time_itoa(42);
  ```

  Most of the formatting functionality is available at compile time
  with a notable exception of floating-point numbers and pointers.
  Thanks @alexezeder.

- Optimized handling of format specifiers during format string
  compilation. For example, hexadecimal formatting (`"{:x}"`) is now
  3-7x faster than before when using `format_to` with format string
  compilation and a stack-allocated buffer
  (https://github.com/fmtlib/fmt/issues/1944).

  Before (7.1.3):

      ----------------------------------------------------------------------------
      Benchmark                                  Time             CPU   Iterations
      ----------------------------------------------------------------------------
      FMTCompileOld/0                         15.5 ns         15.5 ns     43302898
      FMTCompileOld/42                        16.6 ns         16.6 ns     43278267
      FMTCompileOld/273123                    18.7 ns         18.6 ns     37035861
      FMTCompileOld/9223372036854775807       19.4 ns         19.4 ns     35243000
      ----------------------------------------------------------------------------

  After (8.x):

      ----------------------------------------------------------------------------
      Benchmark                                  Time             CPU   Iterations
      ----------------------------------------------------------------------------
      FMTCompileNew/0                         1.99 ns         1.99 ns    360523686
      FMTCompileNew/42                        2.33 ns         2.33 ns    279865664
      FMTCompileNew/273123                    3.72 ns         3.71 ns    190230315
      FMTCompileNew/9223372036854775807       5.28 ns         5.26 ns    130711631
      ----------------------------------------------------------------------------

  It is even faster than `std::to_chars` from libc++ compiled with
  clang on macOS:

      ----------------------------------------------------------------------------
      Benchmark                                  Time             CPU   Iterations
      ----------------------------------------------------------------------------
      ToChars/0                               4.42 ns         4.41 ns    160196630
      ToChars/42                              5.00 ns         4.98 ns    140735201
      ToChars/273123                          7.26 ns         7.24 ns     95784130
      ToChars/9223372036854775807             8.77 ns         8.75 ns     75872534
      ----------------------------------------------------------------------------

  In other cases, especially involving `std::string` construction, the
  speed up is usually lower because handling format specifiers takes a
  smaller fraction of the total time.

- Added the `_cf` user-defined literal to represent a compiled format
  string. It can be used instead of the `FMT_COMPILE` macro
  (https://github.com/fmtlib/fmt/pull/2043,
  https://github.com/fmtlib/fmt/pull/2242):

  ```c++
  #include <fmt/compile.h>

  using namespace fmt::literals;
  auto s = fmt::format(FMT_COMPILE("{}"), 42); // 🙁 not modern
  auto s = fmt::format("{}"_cf, 42);           // 🙂 modern as hell
  ```

  It requires compiler support for class types in non-type template
  parameters (a C++20 feature) which is available in GCC 9.3+.
  Thanks @alexezeder.

- Format string compilation now requires `format` functions of
  `formatter` specializations for user-defined types to be `const`:

  ```c++
  template <> struct fmt::formatter<my_type>: formatter<string_view> {
    template <typename FormatContext>
    auto format(my_type obj, FormatContext& ctx) const {  // Note const here.
      // ...
    }
  };
  ```

- Added UDL-based named argument support to format string compilation
  (https://github.com/fmtlib/fmt/pull/2243,
  https://github.com/fmtlib/fmt/pull/2281). For example:

  ```c++
  #include <fmt/compile.h>

  using namespace fmt::literals;
  auto s = fmt::format(FMT_COMPILE("{answer}"), "answer"_a = 42);
  ```

  Here the argument named \"answer\" is resolved at compile time with
  no runtime overhead. Thanks @alexezeder.

- Added format string compilation support to `fmt::print`
  (https://github.com/fmtlib/fmt/issues/2280,
  https://github.com/fmtlib/fmt/pull/2304). Thanks @alexezeder.

- Added initial support for compiling {fmt} as a C++20 module
  (https://github.com/fmtlib/fmt/pull/2235,
  https://github.com/fmtlib/fmt/pull/2240,
  https://github.com/fmtlib/fmt/pull/2260,
  https://github.com/fmtlib/fmt/pull/2282,
  https://github.com/fmtlib/fmt/pull/2283,
  https://github.com/fmtlib/fmt/pull/2288,
  https://github.com/fmtlib/fmt/pull/2298,
  https://github.com/fmtlib/fmt/pull/2306,
  https://github.com/fmtlib/fmt/pull/2307,
  https://github.com/fmtlib/fmt/pull/2309,
  https://github.com/fmtlib/fmt/pull/2318,
  https://github.com/fmtlib/fmt/pull/2324,
  https://github.com/fmtlib/fmt/pull/2332,
  https://github.com/fmtlib/fmt/pull/2340). Thanks @DanielaE.

- Made symbols private by default reducing shared library size
  (https://github.com/fmtlib/fmt/pull/2301). For example
  there was a \~15% reported reduction on one platform. Thanks @sergiud.

- Optimized includes making the result of preprocessing `fmt/format.h`
  \~20% smaller with libstdc++/C++20 and slightly improving build
  times (https://github.com/fmtlib/fmt/issues/1998).

- Added support of ranges with non-const `begin` / `end`
  (https://github.com/fmtlib/fmt/pull/1953). Thanks @kitegi.

- Added support of `std::byte` and other formattable types to
  `fmt::join` (https://github.com/fmtlib/fmt/issues/1981,
  https://github.com/fmtlib/fmt/issues/2040,
  https://github.com/fmtlib/fmt/pull/2050,
  https://github.com/fmtlib/fmt/issues/2262). For example:

  ```c++
  #include <fmt/format.h>
  #include <cstddef>
  #include <vector>

  int main() {
    auto bytes = std::vector{std::byte(4), std::byte(2)};
    fmt::print("{}", fmt::join(bytes, ""));
  }
  ```

  prints \"42\".

  Thanks @kamibo.

- Implemented the default format for `std::chrono::system_clock`
  (https://github.com/fmtlib/fmt/issues/2319,
  https://github.com/fmtlib/fmt/pull/2345). For example:

  ```c++
  #include <fmt/chrono.h>

  int main() {
    fmt::print("{}", std::chrono::system_clock::now());
  }
  ```

  prints \"2021-06-18 15:22:00\" (the output depends on the current
  date and time). Thanks @sunmy2019.

- Made more chrono specifiers locale independent by default. Use the
  `'L'` specifier to get localized formatting. For example:

  ```c++
  #include <fmt/chrono.h>

  int main() {
    std::locale::global(std::locale("ru_RU.UTF-8"));
    auto monday = std::chrono::weekday(1);
    fmt::print("{}\n", monday);   // prints "Mon"
    fmt::print("{:L}\n", monday); // prints "пн"
  }
  ```

- Improved locale handling in chrono formatting
  (https://github.com/fmtlib/fmt/issues/2337,
  https://github.com/fmtlib/fmt/pull/2349,
  https://github.com/fmtlib/fmt/pull/2350). Thanks @phprus.

- Deprecated `fmt/locale.h` moving the formatting functions that take
  a locale to `fmt/format.h` (`char`) and `fmt/xchar` (other
  overloads). This doesn\'t introduce a dependency on `<locale>` so
  there is virtually no compile time effect.

- Deprecated an undocumented `format_to` overload that takes
  `basic_memory_buffer`.

- Made parameter order in `vformat_to` consistent with `format_to`
  (https://github.com/fmtlib/fmt/issues/2327).

- Added support for time points with arbitrary durations
  (https://github.com/fmtlib/fmt/issues/2208). For example:

  ```c++
  #include <fmt/chrono.h>

  int main() {
    using tp = std::chrono::time_point<
      std::chrono::system_clock, std::chrono::seconds>;
    fmt::print("{:%S}", tp(std::chrono::seconds(42)));
  }
  ```

  prints \"42\".

- Formatting floating-point numbers no longer produces trailing zeros
  by default for consistency with `std::format`. For example:

  ```c++
  #include <fmt/core.h>

  int main() {
    fmt::print("{0:.3}", 1.1);
  }
  ```

  prints \"1.1\". Use the `'#'` specifier to keep trailing zeros.

- Dropped a limit on the number of elements in a range and replaced
  `{}` with `[]` as range delimiters for consistency with Python\'s
  `str.format`.

- The `'L'` specifier for locale-specific numeric formatting can now
  be combined with presentation specifiers as in `std::format`. For
  example:

  ```c++
  #include <fmt/core.h>
  #include <locale>

  int main() {
    std::locale::global(std::locale("fr_FR.UTF-8"));
    fmt::print("{0:.2Lf}", 0.42);
  }
  ```

  prints \"0,42\". The deprecated `'n'` specifier has been removed.

- Made the `0` specifier ignored for infinity and NaN
  (https://github.com/fmtlib/fmt/issues/2305,
  https://github.com/fmtlib/fmt/pull/2310). Thanks @Liedtke.

- Made the hexfloat formatting use the right alignment by default
  (https://github.com/fmtlib/fmt/issues/2308,
  https://github.com/fmtlib/fmt/pull/2317). Thanks @Liedtke.

- Removed the deprecated numeric alignment (`'='`). Use the `'0'`
  specifier instead.

- Removed the deprecated `fmt/posix.h` header that has been replaced
  with `fmt/os.h`.

- Removed the deprecated `format_to_n_context`, `format_to_n_args` and
  `make_format_to_n_args`. They have been replaced with
  `format_context`, `` format_args` and ``make_format_args\`\`
  respectively.

- Moved `wchar_t`-specific functions and types to `fmt/xchar.h`. You
  can define `FMT_DEPRECATED_INCLUDE_XCHAR` to automatically include
  `fmt/xchar.h` from `fmt/format.h` but this will be disabled in the
  next major release.

- Fixed handling of the `'+'` specifier in localized formatting
  (https://github.com/fmtlib/fmt/issues/2133).

- Added support for the `'s'` format specifier that gives textual
  representation of `bool`
  (https://github.com/fmtlib/fmt/issues/2094,
  https://github.com/fmtlib/fmt/pull/2109). For example:

  ```c++
  #include <fmt/core.h>

  int main() {
    fmt::print("{:s}", true);
  }
  ```

  prints \"true\". Thanks @powercoderlol.

- Made `fmt::ptr` work with function pointers
  (https://github.com/fmtlib/fmt/pull/2131). For example:

  ```c++
  #include <fmt/format.h>

  int main() {
    fmt::print("My main: {}\n", fmt::ptr(main));
  }
  ```

  Thanks @mikecrowe.

- The undocumented support for specializing `formatter` for pointer
  types has been removed.

- Fixed `fmt::formatted_size` with format string compilation
  (https://github.com/fmtlib/fmt/pull/2141,
  https://github.com/fmtlib/fmt/pull/2161). Thanks @alexezeder.

- Fixed handling of empty format strings during format string
  compilation (https://github.com/fmtlib/fmt/issues/2042):

  ```c++
  auto s = fmt::format(FMT_COMPILE(""));
  ```

  Thanks @alexezeder.

- Fixed handling of enums in `fmt::to_string`
  (https://github.com/fmtlib/fmt/issues/2036).

- Improved width computation
  (https://github.com/fmtlib/fmt/issues/2033,
  https://github.com/fmtlib/fmt/issues/2091). For example:

  ```c++
  #include <fmt/core.h>

  int main() {
    fmt::print("{:-<10}{}\n", "你好", "世界");
    fmt::print("{:-<10}{}\n", "hello", "world");
  }
  ```

  prints

  ![](https://user-images.githubusercontent.com/576385/119840373-cea3ca80-beb9-11eb-91e0-54266c48e181.png)

  on a modern terminal.

- The experimental fast output stream (`fmt::ostream`) is now
  truncated by default for consistency with `fopen`
  (https://github.com/fmtlib/fmt/issues/2018). For example:

  ```c++
  #include <fmt/os.h>

  int main() {
    fmt::ostream out1 = fmt::output_file("guide");
    out1.print("Zaphod");
    out1.close();
    fmt::ostream out2 = fmt::output_file("guide");
    out2.print("Ford");
  }
  ```

  writes \"Ford\" to the file \"guide\". To preserve the old file
  content if any pass `fmt::file::WRONLY | fmt::file::CREATE` flags to
  `fmt::output_file`.

- Fixed moving of `fmt::ostream` that holds buffered data
  (https://github.com/fmtlib/fmt/issues/2197,
  https://github.com/fmtlib/fmt/pull/2198). Thanks @vtta.

- Replaced the `fmt::system_error` exception with a function of the
  same name that constructs `std::system_error`
  (https://github.com/fmtlib/fmt/issues/2266).

- Replaced the `fmt::windows_error` exception with a function of the
  same name that constructs `std::system_error` with the category
  returned by `fmt::system_category()`
  (https://github.com/fmtlib/fmt/issues/2274,
  https://github.com/fmtlib/fmt/pull/2275). The latter is
  similar to `std::system_category` but correctly handles UTF-8.
  Thanks @phprus.

- Replaced `fmt::error_code` with `std::error_code` and made it
  formattable (https://github.com/fmtlib/fmt/issues/2269,
  https://github.com/fmtlib/fmt/pull/2270,
  https://github.com/fmtlib/fmt/pull/2273). Thanks @phprus.

- Added speech synthesis support
  (https://github.com/fmtlib/fmt/pull/2206).

- Made `format_to` work with a memory buffer that has a custom
  allocator (https://github.com/fmtlib/fmt/pull/2300).
  Thanks @voxmea.

- Added `Allocator::max_size` support to `basic_memory_buffer`.
  (https://github.com/fmtlib/fmt/pull/1960). Thanks @phprus.

- Added wide string support to `fmt::join`
  (https://github.com/fmtlib/fmt/pull/2236). Thanks @crbrz.

- Made iterators passed to `formatter` specializations via a format
  context satisfy C++20 `std::output_iterator` requirements
  (https://github.com/fmtlib/fmt/issues/2156,
  https://github.com/fmtlib/fmt/pull/2158,
  https://github.com/fmtlib/fmt/issues/2195,
  https://github.com/fmtlib/fmt/pull/2204). Thanks @randomnetcat.

- Optimized the `printf` implementation
  (https://github.com/fmtlib/fmt/pull/1982,
  https://github.com/fmtlib/fmt/pull/1984,
  https://github.com/fmtlib/fmt/pull/2016,
  https://github.com/fmtlib/fmt/pull/2164).
  Thanks @rimathia and @moiwi.

- Improved detection of `constexpr` `char_traits`
  (https://github.com/fmtlib/fmt/pull/2246,
  https://github.com/fmtlib/fmt/pull/2257). Thanks @phprus.

- Fixed writing to `stdout` when it is redirected to `NUL` on Windows
  (https://github.com/fmtlib/fmt/issues/2080).

- Fixed exception propagation from iterators
  (https://github.com/fmtlib/fmt/issues/2097).

- Improved `strftime` error handling
  (https://github.com/fmtlib/fmt/issues/2238,
  https://github.com/fmtlib/fmt/pull/2244). Thanks @yumeyao.

- Stopped using deprecated GCC UDL template extension.

- Added `fmt/args.h` to the install target
  (https://github.com/fmtlib/fmt/issues/2096).

- Error messages are now passed to assert when exceptions are disabled
  (https://github.com/fmtlib/fmt/pull/2145). Thanks @NobodyXu.

- Added the `FMT_MASTER_PROJECT` CMake option to control build and
  install targets when {fmt} is included via `add_subdirectory`
  (https://github.com/fmtlib/fmt/issues/2098,
  https://github.com/fmtlib/fmt/pull/2100).
  Thanks @randomizedthinking.

- Improved build configuration
  (https://github.com/fmtlib/fmt/pull/2026,
  https://github.com/fmtlib/fmt/pull/2122).
  Thanks @luncliff and @ibaned.

- Fixed various warnings and compilation issues
  (https://github.com/fmtlib/fmt/issues/1947,
  https://github.com/fmtlib/fmt/pull/1959,
  https://github.com/fmtlib/fmt/pull/1963,
  https://github.com/fmtlib/fmt/pull/1965,
  https://github.com/fmtlib/fmt/issues/1966,
  https://github.com/fmtlib/fmt/pull/1974,
  https://github.com/fmtlib/fmt/pull/1975,
  https://github.com/fmtlib/fmt/pull/1990,
  https://github.com/fmtlib/fmt/issues/2000,
  https://github.com/fmtlib/fmt/pull/2001,
  https://github.com/fmtlib/fmt/issues/2002,
  https://github.com/fmtlib/fmt/issues/2004,
  https://github.com/fmtlib/fmt/pull/2006,
  https://github.com/fmtlib/fmt/pull/2009,
  https://github.com/fmtlib/fmt/pull/2010,
  https://github.com/fmtlib/fmt/issues/2038,
  https://github.com/fmtlib/fmt/issues/2039,
  https://github.com/fmtlib/fmt/issues/2047,
  https://github.com/fmtlib/fmt/pull/2053,
  https://github.com/fmtlib/fmt/issues/2059,
  https://github.com/fmtlib/fmt/pull/2065,
  https://github.com/fmtlib/fmt/pull/2067,
  https://github.com/fmtlib/fmt/pull/2068,
  https://github.com/fmtlib/fmt/pull/2073,
  https://github.com/fmtlib/fmt/issues/2103,
  https://github.com/fmtlib/fmt/issues/2105,
  https://github.com/fmtlib/fmt/pull/2106,
  https://github.com/fmtlib/fmt/pull/2107,
  https://github.com/fmtlib/fmt/issues/2116,
  https://github.com/fmtlib/fmt/pull/2117,
  https://github.com/fmtlib/fmt/issues/2118,
  https://github.com/fmtlib/fmt/pull/2119,
  https://github.com/fmtlib/fmt/issues/2127,
  https://github.com/fmtlib/fmt/pull/2128,
  https://github.com/fmtlib/fmt/issues/2140,
  https://github.com/fmtlib/fmt/issues/2142,
  https://github.com/fmtlib/fmt/pull/2143,
  https://github.com/fmtlib/fmt/pull/2144,
  https://github.com/fmtlib/fmt/issues/2147,
  https://github.com/fmtlib/fmt/issues/2148,
  https://github.com/fmtlib/fmt/issues/2149,
  https://github.com/fmtlib/fmt/pull/2152,
  https://github.com/fmtlib/fmt/pull/2160,
  https://github.com/fmtlib/fmt/issues/2170,
  https://github.com/fmtlib/fmt/issues/2175,
  https://github.com/fmtlib/fmt/issues/2176,
  https://github.com/fmtlib/fmt/pull/2177,
  https://github.com/fmtlib/fmt/issues/2178,
  https://github.com/fmtlib/fmt/pull/2179,
  https://github.com/fmtlib/fmt/issues/2180,
  https://github.com/fmtlib/fmt/issues/2181,
  https://github.com/fmtlib/fmt/pull/2183,
  https://github.com/fmtlib/fmt/issues/2184,
  https://github.com/fmtlib/fmt/issues/2185,
  https://github.com/fmtlib/fmt/pull/2186,
  https://github.com/fmtlib/fmt/pull/2187,
  https://github.com/fmtlib/fmt/pull/2190,
  https://github.com/fmtlib/fmt/pull/2192,
  https://github.com/fmtlib/fmt/pull/2194,
  https://github.com/fmtlib/fmt/pull/2205,
  https://github.com/fmtlib/fmt/issues/2210,
  https://github.com/fmtlib/fmt/pull/2211,
  https://github.com/fmtlib/fmt/pull/2215,
  https://github.com/fmtlib/fmt/pull/2216,
  https://github.com/fmtlib/fmt/pull/2218,
  https://github.com/fmtlib/fmt/pull/2220,
  https://github.com/fmtlib/fmt/issues/2228,
  https://github.com/fmtlib/fmt/pull/2229,
  https://github.com/fmtlib/fmt/pull/2230,
  https://github.com/fmtlib/fmt/issues/2233,
  https://github.com/fmtlib/fmt/pull/2239,
  https://github.com/fmtlib/fmt/issues/2248,
  https://github.com/fmtlib/fmt/issues/2252,
  https://github.com/fmtlib/fmt/pull/2253,
  https://github.com/fmtlib/fmt/pull/2255,
  https://github.com/fmtlib/fmt/issues/2261,
  https://github.com/fmtlib/fmt/issues/2278,
  https://github.com/fmtlib/fmt/issues/2284,
  https://github.com/fmtlib/fmt/pull/2287,
  https://github.com/fmtlib/fmt/pull/2289,
  https://github.com/fmtlib/fmt/pull/2290,
  https://github.com/fmtlib/fmt/pull/2293,
  https://github.com/fmtlib/fmt/issues/2295,
  https://github.com/fmtlib/fmt/pull/2296,
  https://github.com/fmtlib/fmt/pull/2297,
  https://github.com/fmtlib/fmt/issues/2311,
  https://github.com/fmtlib/fmt/pull/2313,
  https://github.com/fmtlib/fmt/pull/2315,
  https://github.com/fmtlib/fmt/issues/2320,
  https://github.com/fmtlib/fmt/pull/2321,
  https://github.com/fmtlib/fmt/pull/2323,
  https://github.com/fmtlib/fmt/issues/2328,
  https://github.com/fmtlib/fmt/pull/2329,
  https://github.com/fmtlib/fmt/pull/2333,
  https://github.com/fmtlib/fmt/pull/2338,
  https://github.com/fmtlib/fmt/pull/2341).
  Thanks @darklukee, @fagg, @killerbot242, @jgopel, @yeswalrus, @Finkman,
  @HazardyKnusperkeks, @dkavolis, @concatime, @chronoxor, @summivox, @yNeo,
  @Apache-HB, @alexezeder, @toojays, @Brainy0207, @vadz, @imsherlock, @phprus,
  @white238, @yafshar, @BillyDonahue, @jstaahl, @denchat, @DanielaE,
  @ilyakurdyukov, @ilmai, @JessyDL, @sergiud, @mwinterb, @sven-herrmann,
  @jmelas, @twoixter, @crbrz and @upsj.

- Improved documentation
  (https://github.com/fmtlib/fmt/issues/1986,
  https://github.com/fmtlib/fmt/pull/2051,
  https://github.com/fmtlib/fmt/issues/2057,
  https://github.com/fmtlib/fmt/pull/2081,
  https://github.com/fmtlib/fmt/issues/2084,
  https://github.com/fmtlib/fmt/pull/2312).
  Thanks @imba-tjd, @0x416c69 and @mordante.

- Continuous integration and test improvements
  (https://github.com/fmtlib/fmt/issues/1969,
  https://github.com/fmtlib/fmt/pull/1991,
  https://github.com/fmtlib/fmt/pull/2020,
  https://github.com/fmtlib/fmt/pull/2110,
  https://github.com/fmtlib/fmt/pull/2114,
  https://github.com/fmtlib/fmt/issues/2196,
  https://github.com/fmtlib/fmt/pull/2217,
  https://github.com/fmtlib/fmt/pull/2247,
  https://github.com/fmtlib/fmt/pull/2256,
  https://github.com/fmtlib/fmt/pull/2336,
  https://github.com/fmtlib/fmt/pull/2346).
  Thanks @jgopel, @alexezeder and @DanielaE.

The change log for versions 0.8.0 - 7.1.3 is available [here](
doc/ChangeLog-old.md).