The "idiomatic" way to access the first element in an array/sequence in julia is to use the `first` function, e.g. `first(arr)` vs. `arr[1]`. This works across

The "idiomatic" way to access the first element in an array/sequence in julia is to use the `first` function, e.g. `first(arr)` vs. `arr[1]`. This works across a larger number of array types, including OffsetArrays with 0-based index offsets.