Re: [heycam/webidl] Define a way to specify a default value for dictionaries (the literal "{}") and require it to be specified for the dictionary arguments that are required to be optional. (#750)

> (fwiw, webidl2.js and bikeshed do allow this, too.)

Right, it arguably used to be OK (and was supported in Gecko) until the changes in this PR.  At this point it's clearly not OK, though.  IDL `null` (not to be confused with JS `null`!) is not a valid value for a dictionary type.

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