I just presented “signed integers are two’s complement” http://wg21.link/p0907r0 to a joint session of C++ numerics and undefined behavior groups!
Broad support, but they want to keep UB on overflow (and have separate type or operator for wrap). I’ll update the paper 
Feel free to plagiarize any of my borderline-rants you can find on SO where I describe how ability to interchange data with the world hinges on 8-bit bytes.
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Oh nice! In fact, do you want to co-author the paper? Your input as a C library maintainer is super valuable.
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I sorta want to say yes but not sure what I'd be getting myself into. ;-)
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Sweet! I’ll write the first draft, and then we can iterate. I’ve been meaning to email Roland as well to get his input. Will do that… This one won’t be as easy as two’s complement but I think we can make it happen.
End of conversation
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I just have to write the wording. 
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