Seems like the justification would be to keep the type information when going back and forth to Ion. More like "multiple nullable types" instead of "multiple ty

Seems like the justification would be to keep the type information when going back and forth to Ion. More like "multiple nullable types" instead of "multiple types of null" userBirthDay: null <-- ok, but what type is it? String? Int? Timestamp? userBirthDay: null.timestamp <-- ok, it's a timestamp typed variable, but we don't know the value. Yay, happy programmer.