test coverage

[hildjj]

• Add test coverage for maxBigIntBytes
• Move maxBigIntBytes checking to initialization time.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6873a81) to head (3c735be).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #112   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines         5234      5266   +32     
  Branches       752       758    +6     
=========================================
+ Hits          5234      5266   +32     

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