I think it s a bug, and I think your proposal is appropriate.

From: [email protected]
Subject: escaping - in /u RegExp 
Date: Tue, 13 Jan 2015 13:23:54 -0800
To: [email protected]

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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