[libcxx-commits] [libcxx] Implement P1885R12: `<text_encoding>` header (PR #141312)

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cor3ntin wrote:

I have no idea what libc++ policies are in terms of backporting, but given that this feature is most useful for legacy systems, it might be reasonable to make it available in C++20 (we need consteval) - assuming there are appropriate warnings.

https://github.com/llvm/llvm-project/pull/141312