fix: roll back preferred units

[nstarman]

This deserves more thought. I think perhaps a .preferred() method would be better.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.98%. Comparing base (3c8c06e) to head (6abf287). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #161 +/- ## ========================================== - Coverage 91.05% 90.98% -0.07% ========================================== Files 31 31 Lines 1565 1553 -12 ========================================== - Hits 1425 1413 -12 Misses 140 140 ```

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