Fix: Assert that values are lists

[localheinz]

This pull request

• asserts that values are lists

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.73%. Comparing base (85d36a4) to head (f36a12f).

❗ Current head f36a12f differs from pull request most recent head d6e91f0

Please upload reports for the commit d6e91f0 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #928   +/-   ##
=========================================
  Coverage     98.73%   98.73%           
  Complexity       48       48           
=========================================
  Files             6        6           
  Lines           158      158           
=========================================
  Hits            156      156           
  Misses            2        2           

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