Add check of enum values defined for a specific index

[mrbean-bremen]

• fix checking of multi-valued tags with defined enum values
• fixes #87

[codecov-commenter]

Codecov Report

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

Project coverage is 89.95%. Comparing base (e8644e2) to head (90f5eb8). Report is 7 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #88 +/- ## ========================================== + Coverage 89.82% 89.95% +0.12% ========================================== Files 15 15 Lines 1632 1652 +20 ========================================== + Hits 1466 1486 +20 Misses 166 166 ```

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