Handle big numbers in message signature validation

[olomix]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.77%. Comparing base (51e4628) to head (5bea338).
Report is 70 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #420      +/-   ##
===========================================
- Coverage    22.48%   21.77%   -0.71%     
===========================================
  Files          315      297      -18     
  Lines         8829     9272     +443     
===========================================
+ Hits          1985     2019      +34     
- Misses        6844     7253     +409     

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