I try to set branching priorities on variables using `CPXcopyorder(env, lp, cnt, indices, priority, direction)`

. Particlularly I want to get the indices of the varialbes of the JuMP model in the CPLEX model. I tried:

```
index = model[:x].index.value - 1
```

and

```
index = CPLEX.column(backend(model), index(model[:x]))- 1
```

both returning the same values for each variable. Are the above statements equivalent or is this just a coincidence? Which one is correct (if any)?