MAINT: Clean up code

[bashtage]

Fix small issues identified by ruff
Improve typing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.57%. Comparing base (53f86bb) to head (70779ba).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #623      +/-   ##
==========================================
- Coverage   99.58%   99.57%   -0.01%     
==========================================
  Files         100      100              
  Lines       17288    17288              
  Branches     2464     1443    -1021     
==========================================
- Hits        17216    17215       -1     
  Misses         27       27              
- Partials       45       46       +1     

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