Re: [heycam/webidl] Better regular expression for identifiers (#632)

I agree with @saschanaz . We need to discuss which is better before merging the patch.
Obviously, `_?[A-Za-z-][0-9A-Z_a-z-]*` allows `_-` and `--`, while `[_-]?[A-Za-z][0-9A-Z_a-z-]*` doesn't.

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