603: Fix string iteration in aliasing

[charles-turner-1]

Change Summary

• Test that we don't iterate over strings when they're in a collection via an ill-thought through str fallback. 947b02b
• Add code fixing it. aa27725

Related issue number

Closes #603

Checklist

• Unit tests for the changes exist
• Tests pass on CI
• [N/A] Documentation reflects the changes where applicable

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.32%. Comparing base (c55785b) to head (aa27725).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #604      +/-   ##
==========================================
- Coverage   99.32%   99.32%   -0.01%     
==========================================
  Files          19       19              
  Lines        1927     1926       -1     
==========================================
- Hits         1914     1913       -1     
  Misses         13       13              

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[charles-turner-1]

@rbeucher Take a look at Benoit's issue linked to this - I feel like we might wanna link up some sort of automated bug triage/investigator? Took me about 5 minutes to fix it thanks to how well formulated it was