fix: Make enums tolerate multiple sequence types

[AndreasAlbertQC]

Motivation

Fixes #17, which actually has nothing to do with parquet. The parquet connection just happened because the enum categories are always a list after going through parquet.

Changes

• Added list cast to ensure that Enum.categories is always stored as a list internally.
• Added a test that fails without the fix. @delsner @borchero : I wasn't 100% sure what file the test should be in. Let me know if you think it should go somewhere else.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3bf3acf) to head (a47a169).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #18   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           37        37           
  Lines         1807      1807           
=========================================
  Hits          1807      1807           

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[borchero]

Ha, weird edge case 👀 thanks for fixing!