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_at_[hidden]>
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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>