feat: rm to_units_value

[nstarman]

There aren't really any optimized forms of to_units().value.

[codecov[bot]]

Codecov Report

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

Project coverage is 91.31%. Comparing base (410151d) to head (753982f). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #173 +/- ## ========================================== - Coverage 91.38% 91.31% -0.07% ========================================== Files 33 33 Lines 1601 1589 -12 ========================================== - Hits 1463 1451 -12 Misses 138 138 ```

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