"StringValue of ReservedWord" is used but not defined

[bakkot]

The last early error in the early errors for Identifiers says

It is a Syntax Error if StringValue of IdentifierName is the same String value as the StringValue of any ReservedWord except for yield or await.

But there are no semantics given for StringValue for ReservedWords.

cc @kmiller68

[kmiller68]

Semi related: Is there a reason we don't just treat escaped reserved words as identifiers everywhere? That seems like it would simplify the grammar but I don't think is super important.

[allenwb]

But the current spec. says:

A reserved word is an IdentifierName that...

and so the StringValue definition for IdentifierName is intended to appiy Reserved Words. That may have been clear in previous editions.