Fix set and remove method signatures

[vtintillier]

Fixes #80.

[ashleyfrieze]

Nice. Looks like good code and some useful tests to secure down the structure you want.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1cb1edd) 80.16% compared to head (a6ffe35) 80.14%.

❗ Current head a6ffe35 differs from pull request most recent head 1cc987d. Consider uploading reports for the commit 1cc987d to get more accurate results

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Additional details and impacted files

@@             Coverage Diff              @@
##               main      #81      +/-   ##
============================================
- Coverage     80.16%   80.14%   -0.03%     
+ Complexity      344      343       -1     
============================================
  Files            49       49              
  Lines           837      836       -1     
  Branches         44       44              
============================================
- Hits            671      670       -1     
  Misses          149      149              
  Partials         17       17              

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