Re: [heycam/webidl] Add bigint type (#525)

Well, the first built-in method proposed (not yet shipped anywhere AFAIK) is  tc39/ecma402#236 which works like operators like `*` and calls ToNumeric on the argument (which will convert a string to Number, or `{valueOf(){return 5n}}` to `5n`), then checks whether it's Number or BigInt. That's what I was suggesting in https://github.com/heycam/webidl/pull/525#issuecomment-444073662 , but if these semantics seem terrible, we could go with something more restrictive since AFAIK no overloaded methods have shipped, just overloaded operators (which have more legacy constraints).

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