escaping - in /u RegExp

[Allen Wirfs-Brock]

Would those of you who consider yourselves RegExp experts take a look at https://bugs.ecmascript.org/show_bug.cgi?id=3519  Is this a bug? If so, what is the fix?

This construction for Identity Escape goes back to Norbert's original proposal http://norbertlindenberg.com/2012/05/ecmascript-supplementary-characters/index.html 

Perhaps we need to add a:
  ClassAttom[U] :: [+U]  \-

production or some such to the pattern grammar.

Allen
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