Add support for Symbol

[fensterhebel]

fixes #102

[hildjj]

Looks like a few lint issues. Also test comment() and diagnose() please.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b69a1d3) to head (e49efe6).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #103   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines         5124      5161   +37     
  Branches       712       723   +11     
=========================================
+ Hits          5124      5161   +37     

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[fensterhebel]

I hope all (reasonable) test cases are covered.

[hildjj]

Thanks!