fix: unique_id is not a string

[andreasbrett]

fixes #373

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.15%. Comparing base (ac1cf1a) to head (0e642c2).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
- Coverage   98.20%   98.15%   -0.06%     
==========================================
  Files          20       20              
  Lines         668      811     +143     
==========================================
+ Hits          656      796     +140     
- Misses         12       15       +3     

Flag	Coverage Δ
unittests	98.15% <100.00%> (-0.06%)	⬇️

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[eifinger]

Great thank you!