Re: [heycam/webidl] State that by default all objects are created in the relevant realm of `this` (#135)

In general, staying in the same realm when you go parallel makes sense.  The main footguns with object creation after going parallel are:

1.  Your global can get torn down around you (e.g. `iframe.remove()`).  It still exists, but maybe not in the state you expect it to be in.
2.  If the object creation has observable side-effects, or is otherwise synchronously observable, it needs to happen off a task, not directly in the parallel section.

Apart from that, using the same global unless explicitly stated otherwise makes sense to me.

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