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From @peastman:

> Test cases are failing. I believe it's because the parent for a ScaledUnit needs to be a Unit, not another ScaledUnit. So in the line
>
> ```
>  hartree_base_unit = ScaledUnit(4.3597447222071e-18, joule_base_unit, "hartree", "Ha")
> ```
>
> replace joule_base_unit with joule.