fix(utils): make validatorSetUnpack stricter

[oXtxNt9U]

Summary

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.60%. Comparing base (e7a88f0) to head (f03d6f3).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1248       +/-   ##
============================================
+ Coverage    53.08%   98.60%   +45.52%     
============================================
  Files         1122        3     -1119     
  Lines        62347      430    -61917     
  Branches      1697       77     -1620     
============================================
- Hits         33095      424    -32671     
+ Misses       29122        4    -29118     
+ Partials       130        2      -128     

Flag	Coverage Δ
contracts	98.60% <ø> (?)
packages	?

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