chore: add a test with a model when defining multiple optional fields

[art049]

Add a regression test for #379. Kudos to @netomi again!

[github-actions]

🚀 Deployed on https://docs-preview-426--odmantic.netlify.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.18%. Comparing base (cf7b2b4) to head (95413b3).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #426   +/-   ##
=======================================
  Coverage   99.18%   99.18%           
=======================================
  Files          52       52           
  Lines        5033     5040    +7     
  Branches      712      712           
=======================================
+ Hits         4992     4999    +7     
  Misses         37       37           
  Partials        4        4           

Flag	Coverage Δ
tests-3.10-4.4-standalone	93.63% <100.00%> (+<0.01%)	⬆️
tests-3.10-5-standalone	93.63% <100.00%> (+<0.01%)	⬆️
tests-3.10-6-standalone	93.63% <100.00%> (+<0.01%)	⬆️
tests-3.11-4-replicaSet	99.02% <100.00%> (+<0.01%)	⬆️
tests-3.11-4.2-sharded	93.63% <100.00%> (+<0.01%)	⬆️
tests-3.11-4.4-standalone	93.63% <100.00%> (+<0.01%)	⬆️
tests-3.11-5-standalone	93.63% <100.00%> (+<0.01%)	⬆️
tests-3.11-6-standalone	93.63% <100.00%> (+<0.01%)	⬆️
tests-3.8-4.4-standalone	93.58% <100.00%> (+<0.01%)	⬆️
tests-3.8-5-standalone	93.58% <100.00%> (+<0.01%)	⬆️
tests-3.8-6-standalone	93.58% <100.00%> (+<0.01%)	⬆️
tests-3.9-4.4-standalone	93.54% <100.00%> (+<0.01%)	⬆️
tests-3.9-5-standalone	93.54% <100.00%> (+<0.01%)	⬆️
tests-3.9-6-standalone	93.54% <100.00%> (+<0.01%)	⬆️

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