That's just text. In one sense, yes, it's arbitrary bits. But it's also clearly text. It's probably not what was referred to. If you have binary data that's

That's just text. In one sense, yes, it's arbitrary bits. But it's also clearly text. It's probably not what was referred to. If you have binary data that's encoded as text, it seems obvious that that can be embedded in text. It probably wouldn't be worth mentioning that "Any binary allowed between the quotes."