Re: [heycam/webidl] Does a non-nullable and non-required dictionary member of interface type make sense? (#176)

No, we want to make `foo({ target: null })` throw, and `foo({ target: undefined })` or `foo({ })` work. Thus we want to **discourage**

```webidl
dictionary Foo {
  EventTarget? target = null;
};
```

in favor of

```webidl
dictionary Foo {
  EventTarget target;
};
```

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