Add property checks for Nat

[johnynek]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.50%. Comparing base (04a0e87) to head (db377b8).
Report is 11 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1175      +/-   ##
==========================================
+ Coverage   91.32%   91.50%   +0.18%     
==========================================
  Files          96       96              
  Lines       11846    12010     +164     
  Branches     2675     2778     +103     
==========================================
+ Hits        10818    10990     +172     
+ Misses       1028     1020       -8     

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