fix: correct handling optional types

[seandstewart]

None is always the last arg in an optional type, which prevents proper behavior for null values in the default case. This change adds short-circuiting to our routines to handle nullable types correctly.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.92%. Comparing base (93743e3) to head (79e431a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   96.77%   96.92%   +0.14%     
==========================================
  Files          21       21              
  Lines        1489     1494       +5     
  Branches      265      267       +2     
==========================================
+ Hits         1441     1448       +7     
+ Misses         28       27       -1     
+ Partials       20       19       -1     

Flag	Coverage Δ
unittests	96.65% <100.00%> (+0.14%)	⬆️

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