[heycam/webidl] What is ArgumentNameKeyword for? (#799)

Reading #700, #779, and whatwg/html#4869, I wonder why we need a list of keyword to allow them to be used in arguments name.

Even without it, we can use any reserved words as identifiers if we attach a leading "_" (https://heycam.github.io/webidl/#idl-names), and _ArgumentName_ accepts identifiers in grammar.
Do we have any reason to allow these (limited) reserved words to be used in arguments' names without "_", though we can also use other words in practice?

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