TYP: Typing improvements

[bashtage]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.59%. Comparing base (4e9543d) to head (1c9b344).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #652   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files          99       99           
  Lines       17332    17335    +3     
  Branches     1445     1445           
=======================================
+ Hits        17262    17265    +3     
  Misses         26       26           
  Partials       44       44           

Flag	Coverage Δ
adder	99.57% <100.00%> (+<0.01%)	⬆️
subtractor	99.57% <100.00%> (+<0.01%)	⬆️

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