This may be relevant to, and was briefly mentioned in the discussion of https://github.com/sg16-unicode/sg16/issues/2 

(Your link is to a newer revision compared to the one linked in the issue discussion - good to know they keep working on it!)

On Sat, Sep 22, 2018, 12:03 PM Hubert Tong <hubert.reinterpretcast@gmail.com> wrote:
I was recently made aware that SC 35/WG 5 has been updating the following document for Unicode concerns.

http://open-std.org/JTC1/SC35/WG5/docs/30112d12.pdf

I am forwarding to this group in case there is anything in the document we might find useful or have concerns with.

-- HT

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