What happens with a string with Nil encoding if I ...

If I have a string with Nil encoding, how do methods such as .Middle, .IndexOf, .Length behave? Do they assume the string is a sequence of 1-byte characters?

It should return the same values such as the Binary ones (LenB, MidB, …).
One that didn’t do so has recently been fixed: <https://xojo.com/issue/54870>
That’s why I assume they should all do that. And if not, it could be considered a bug.