I guess you were talking about web compat mode. I think the question was more intriguing without u-flag. The u-flag locks it down pretty tightly.
/\g/ is fine. Are you thinking of regular expressions with the `u` flag?
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Annex B is reality though

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Yep, it's an IdentityEscape. Start here: https://tc39.es/ecma262/#prod-annexB-AtomEscape …
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Actually looks like I have to fix a bunch of cases in tenko that relate to this (my) confusion. Fun.
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Hmmmm. Yes, let me repost :0
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Wait, how? From https://tc39.es/ecma262/#prod-AtomEscape … -> CharacterEscape -> IdentityEscape -> [+U]SyntaxCharacter, or -> [~U]SourceCharacterbut not UnicodeIDContinue And `g` is id_continue, so wouldn't that make it illegal with and without u-flag? What step am I missing? :)pic.twitter.com/Efgmj2jzHh
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