Well, let's think about it some more...
Our so called computers have no numbers, not signed or unsigned or otherwise. They have no operations like ADD, SUB, MOV on those non-existent numbers.
They are just collections of atoms, mostly silicon now a days, interacting with each other.
Which we humans interpret as doing something meaningful and perhaps useful.
That might be an extreme view of things but I say it only to point out that there are many layers of abstraction to this "reality" we all live in. Most of it constructed in our minds.
So when I said, "ownership in many languages is a very real thing to me". I did indeed mean "real" as in the fictional abstraction word of high level programming languages. For example in C, C++, Pascal, PL/M etc. It is a thing you have to think about if you want your program to be robust, even if those language specifications never mention it.