[libcxx-commits] [libcxx] [libc++] Complete `<charconv>` for 64-bit `long double` platforms (PR #117125)

[Michael Jones via libcxx-commits]

https://github.com/michaelrj-google commented:

We already have support for most types of long double: 64 bit, 80 bit, and 128 bit. We currently don't support `long double` as `double double` (only used by zOS AFAIK), but that's the only variant that I know we're missing.

https://github.com/llvm/llvm-project/pull/117125