fix: CRAN NOTEs related to S3 methods

[dincerti]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e121347) 92.51% compared to head (d5228c2) 92.51%.

❗ Current head d5228c2 differs from pull request most recent head 7d9ce7a. Consider uploading reports for the commit 7d9ce7a to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   92.51%   92.51%           
=======================================
  Files          64       64           
  Lines        5543     5544    +1     
=======================================
+ Hits         5128     5129    +1     
  Misses        415      415           

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