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

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alexfh wrote:

> I would tend to make the default "the specialization is provided" until we've figured out our deprecation story better.

I'm fine with either option. Thanks!

LGTM

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