Re: [whatwg/url] new URL('file://').origin is 'null' (#310)

Thanks for the explanation. Still, why string `"null"`? Does the string `"null"` have any meaning in the web security model? For example, if I wanted to check if two URLs are considered same-origin, it seems like I now can't just do `url.origin === url.origin`, since two URLs with `"null"` origin should probably _not_ be considered same-origin, right? But it's not obvious that that is a valid case that needs to be handled. A type `string | null` would make it a lot clearer that a URL _may not have an origin_ and that that is a case that needs to be accounted for.

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