Re: [heycam/webidl] Disallow underscore-and-hyphen only identifiers (#633)

It does. ` _?` matches ""(empty), `[A-Za-z-]` matches "-", and `[0-9A-Z_a-z-]*` matches "123". It also matches "`---`" in the same way.

I agree it is the only use case, and is unusual in other IDLs. But we already have it in CSSOM spec.
Andf for numbers, they are not identifer tokens, and our previous (before #612) regular expression did not allow them.

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