feat: include field names in Validate() errors

[adamdecaf]

Also check an invalid pacs.008

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9bc3f22) 85.49% compared to head (8165768) 83.93%.

❗ Current head 8165768 differs from pull request most recent head ff7f60e. Consider uploading reports for the commit ff7f60e to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
- Coverage   85.49%   83.93%   -1.56%     
==========================================
  Files          12       12              
  Lines         193      193              
==========================================
- Hits          165      162       -3     
- Misses         24       26       +2     
- Partials        4        5       +1     

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