Add logs to costs computation

[bokub]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.57%. Comparing base (611d1dd) to head (42fd633).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/index.ts	0.00%	5 Missing ⚠️
src/cost.ts	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
- Coverage   39.97%   39.57%   -0.41%     
==========================================
  Files           8        8              
  Lines         783      791       +8     
  Branches       84       85       +1     
==========================================
  Hits          313      313              
- Misses        467      475       +8     
  Partials        3        3              

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