Fix type for filterable attributes

[sanders41]

Closes #1447

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d8cd0d5) to head (d7bf996).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1448   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         3197      3197           
=========================================
  Hits          3197      3197           

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