iOS Foundations JSON Data Question Incorrect

In the iOS Foundations course, Lesson 09 Quiz asks:

Is the following JSON valid? {“languages”: [“English”, “French”, 42]}

The correct answer is “Yes”, but the quiz marks that answer as incorrect. I believe this has more to do with swift because this is valid JSON. JSON arrays can contain various data types. Maybe the question needs to be reworded to ask if this is valid JSON for swift?