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

`null` is a valid value for a `Thing`.  It means "empty dictionary".

You can't do `Thing? aThing` to start with.  See https://heycam.github.io/webidl/#idl-dictionaries where it says:

> If the type of the dictionary member, after resolving typedefs, is a nullable type, its inner type must not be a dictionary type.

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