Fix Enum casts being documented as "mixed" type

[codecov[bot]]

Codecov Report

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

Project coverage is 90.82%. Comparing base (0f30a3a) to head (b6f8d24).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #137 +/- ## ============================================ + Coverage 90.81% 90.82% +0.01% - Complexity 397 399 +2 ============================================ Files 24 24 Lines 1448 1450 +2 ============================================ + Hits 1315 1317 +2 Misses 133 133 ```

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