fix: support string compatible types in to_string

[eddycharly]

Use go-cmp instead of deep equal.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.77%. Comparing base (e430401) to head (182fbce).
Report is 5 commits behind head on main.

❗ Current head 182fbce differs from pull request most recent head f74a5c1

Please upload reports for the commit f74a5c1 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   88.51%   90.77%   +2.26%     
==========================================
  Files          15       15              
  Lines        2594     2212     -382     
==========================================
- Hits         2296     2008     -288     
+ Misses        204      112      -92     
+ Partials       94       92       -2     

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