A. Jiang

Command options `-std:c++20 -c --driver-mode=cl` seemingly work, but very poorly ([link](https://godbolt.org/z/zG61P7Toa)).

It seems that we should use `iter_value_t _Temp(_RANGES iter_move(_First));`.

LWG-3921 may be related - it seems that `hh_mm_ss` is not actually usable for formatting `duration` (at least directly).

I guess I've made some tests and an incomplete conclusion for the differences. `consteval` and immediate-escalation make the function only callable in restrict contexts, while `constexpr` doesn't. Sometimes the restriction...

I'd like to copy the definition of `checked_array_iterator` into cpprestsdk's header (with de-_Uglification), if we don't want to rely on GSL or C++20 (for `span`).

The error code is 1920 ("The file cannot be accessed by the system.") on my machine, reported by `CreateFileW`. Can we just return `true` when error code 1920 (and it...

`char8_t` has already broken some things... However, for a JSON library, have you found any problem of which a fix will be breaking, if we instantly adopt `char8_t`? [P2626R0](https://wg21.link/p2626r0) seems...

Maybe a duplicate of LWG-2381/#2388. Unfortunately the libcxx tests shouldn't be enabled at this moment, as `"inf"` and `"nan"` are intendedly not supported in the resolution of LWG-2381.

~I've reported LLVM-60597.~ (It shouldn't be reported again.) I think this is no longer a bug of MSVC STL (but of libc++) after implementing LWG-2381 in STL.