[libcxx-commits] [libcxx] [libc++] Improve performance of std::midpoint for small types (PR #192804)

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serge-sans-paille wrote:

@philnik777 there was an issue on some platform when `_BigInt` went over 128bits, I wonder if that's platform-specific, or if we have the guarantee that it's always available for at least 128bits?

https://github.com/llvm/llvm-project/pull/192804