[libcxx-commits] [libcxx] [libc++] Reintroduce the removed std::char_traits specialization (PR #66153)

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alexfh wrote:

Having cleaned up a large chunk of our internal generic char_traits usages, I'd like a way to prevent backsliding, if possible. Making this conditional on a preprocessor definition would be an option, if not too rigid one.

https://github.com/llvm/llvm-project/pull/66153