[libcxx-commits] [libcxx] [libc++] Use std::to_chars to format thread::id and canonicalize the representation across platforms (PR #181624)

[Louis Dionne via libcxx-commits]

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ldionne wrote:

This explains why @mordante originally implemented it that way. You mention the output may change: can you describe it changes from what to what?

Can you also confim that there is nothing normative requiring `thread::id`'s `std::format` result to match the stream output operators? If that's the case, then I guess it just means that @mordante wanted to provide that guarantee as a QOI matter but it's not required by the Standard, and we can consider this change. If there's normative wording to that effect, well, we can't make this change.

https://github.com/llvm/llvm-project/pull/181624