This section suggests the Spread Operator syntax only works for iterable object literals. In fact, generic Object literal declarations also support spread operator assignment syntax:

"Note that the spread operator isn’t limited to arrays and arguments. The spread operator can be used with any iterable object. Iterable is a protocol in ES6 that allows you to turn any object into something that can be iterated over. We’ll research the iterable protocol in Iteration and Flow Control."

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Is there another section where non-iterable Object Literal spread syntax is covered?