Re: [heycam/webidl] Allow records to be omitted (#304)

Actually, add:

4. Need to re-allow nullable record operation arguments.

> I can't find 2 of your list

Hmm.  I guess we effectively only had this for trailing optional records, not all records, and your PR changes that part.

> Why should we allow records to be nullable?

Why shouldn't we?  Note that they are _already_ allowed to be nullable everywhere except dictionary members and operation arguments.  The only reason they're not allowed there is because `null` used to be a valid record value, and the idea was that if null is passed that means "record produce from `null`", not "null".  But if `null` is _not_ a valid record value, then a nullable record makes perfect sense.

> Anyway, it's probably best if @jyasskin or you or @domenic do this instead.

Sure.  I'm pretty swamped with other things, but if @jyasskin or @domenic don't get to this by the time I clear other things off my plate and am seriously blocked on this to implement `record` in Gecko I will do it.

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