fix(serializer): ensure presence of optional values is expressed as 0 or 1

[sebastijankuzner]

Summary

Throw on malformed data.

Checklist

• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.14%. Comparing base (741358a) to head (c3c446c).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1394      +/-   ##
===========================================
+ Coverage    61.08%   62.14%   +1.06%     
===========================================
  Files          927      931       +4     
  Lines        14945    15390     +445     
  Branches      1659     1742      +83     
===========================================
+ Hits          9129     9564     +435     
- Misses        5811     5819       +8     
- Partials         5        7       +2     

Flag	Coverage Δ
contracts	97.74% <ø> (?)
packages	61.08% <100.00%> (+<0.01%)	⬆️

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