fix: get key to string

[Krukov]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.26%. Comparing base (5a5d22e) to head (3044e6b).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #345      +/-   ##
==========================================
- Coverage   93.32%   93.26%   -0.06%     
==========================================
  Files          54       54              
  Lines        3640     3640              
  Branches      494      494              
==========================================
- Hits         3397     3395       -2     
- Misses        134      135       +1     
- Partials      109      110       +1     

Flag	Coverage Δ
unittests	93.18% <100.00%> (-0.06%)	⬇️

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