Re: [heycam/webidl] Modernize invoking user code (#113)

> if code in window1 does var f = new window2.Function("stuff") then f has window1 as its script-or-module and window2 as its Realm?

Yes, exactly.

As I said, I see two alternatives here. To rephrase them slightly:

- "report an exception" takes a script. It uses that script's filename, and dispatches error events to that script's global.
- "report an exception" takes a script and a global. It uses that script's filename, but dispatches error events to the supplied global, which may not equal the script's global.

In our example, the first alternative dispatches error events to `window1`, whereas the second allows the possibility of dispatching them to `window2` if we thread everything through correctly.

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