Re: [heycam/webidl] Sort out when dictionaries and records should have default values (#76)

I think I'd argue that a dictionary member that is a dictionary should have a default value as well. 
```
dictionary Foo { required long foo1; };
dictionary Bar { Foo myFoo; };
```
```
...
  void doStuff(optional Bar myBar);
```
Invoking `doStuff()` should throw. Invoking `doStuff({ myBar: { foo1: 42 }})` would be okay, as far as IDL is concerned.

I don't think there's a good reason to make dictionary handling inconsistent between it being an argument and a member of another dictionary.

(According to bz on IRC Firefox already does this.)

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