Deduplicate enum cases properly when generating specification from source

[codecov[bot]]

Codecov Report

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

Comparison is base (13c5c27) 100.00% compared to head (6e854b6) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #201 +/- ## =========================================== Coverage 100.00% 100.00% Complexity 261 261 =========================================== Files 40 40 Lines 4168 4168 =========================================== Hits 4168 4168 ```

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