Cleanup dictionaries during unload

[pat-s]

fix #218

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (94bb4e6) 80.61% compared to head (519bced) 80.61%.
Report is 1 commits behind head on main.

❗ Current head 519bced differs from pull request most recent head 80412ef. Consider uploading reports for the commit 80412ef to get more accurate results

Files	Patch %	Lines
R/autoplot.R	20.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #233   +/-   ##
=======================================
  Coverage   80.61%   80.61%           
=======================================
  Files          31       31           
  Lines        2074     2074           
=======================================
  Hits         1672     1672           
  Misses        402      402           

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