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

Well, `Intl.NumberFormat.prototype.format`, per "jsidl".

We also have a case that shows that allowing a union/overload will likely lead to APIs with implicit coercion of Number to BigInt, which is something TC39 does not want, as far as I know: https://github.com/WebAssembly/JS-BigInt-integration/issues/12.


I don't think there's a way to enforce the difference through IDL. I guess you could try something along the lines of that when there's a union, the corresponding algorithm cannot contain a Number to BigInt operation, but try enforcing that realistically …

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