Implement traits for unsafe function values

[joshlf]

Closes #2617

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.75%. Comparing base (0e51bab) to head (1f6612d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2697   +/-   ##
=======================================
  Coverage   88.75%   88.75%           
=======================================
  Files          20       20           
  Lines        5343     5343           
=======================================
  Hits         4742     4742           
  Misses        601      601           

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