I would call the class in question `ObjectView`, or something along those lines, since this is more analogous to a view into an array (like our `SignalView` class), than Python's `slice` object. That said, the current `ObjSlice` class doesn't have all the functionality that I would expect from a view (I think we still need to decide what kind of functionality we want to end up in this class, but that's not for this PR).