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

Perhaps as a stopgap we could allow setting dictionary members as nullable if they're required dictionaries?

e.g.

```webidl
dictionary Foo {required bool thing;};
dictionary Bar {Foo? foo;}
```

stumbling across this while designing XRTest, which isn't a web-exposed API but it doesn't seem like an uncommon pattern

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