Resolve warnings in benchmarks

[vil02]

Continuation/should be part of #568.

The goal is to fix the failing CodeQL.

Also, I decided to remove the just added asserts (they were ignore in the release builds anyway).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.12%. Comparing base (80330eb) to head (fbeb809).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #569      +/-   ##
==========================================
- Coverage   97.12%   97.12%   -0.01%     
==========================================
  Files          98       98              
  Lines       11289    11289              
  Branches      796      796              
==========================================
- Hits        10965    10964       -1     
- Misses        324      325       +1     

Flag	Coverage Δ
unittests	97.12% <ø> (-0.01%)	⬇️

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