Refactor: make UnwrapToRoot support joined errors

[tiendc]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.90%. Comparing base (c146d28) to head (cac631f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   98.64%   98.90%   +0.27%     
==========================================
  Files          10       10              
  Lines         438      361      -77     
==========================================
- Hits          432      357      -75     
+ Misses          4        2       -2     
  Partials        2        2              

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