feat: Default to union operator for type hints

[koxudaxi]

Closes: #1523

[coderabbitai]

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/default-union-operator

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[codspeed-hq]

CodSpeed Performance Report

Merging #2703 will not alter performance

_{Comparing feat/default-union-operator (bec6c81) with main (1b5d3fb)}

Summary

✅ 52 untouched
⏩ 10 skipped¹

Footnotes

1. 10 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.33%. Comparing base (1b5d3fb) to head (bec6c81).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2703      +/-   ##
==========================================
- Coverage   99.44%   99.33%   -0.11%     
==========================================
  Files          81       81              
  Lines       11449    11478      +29     
  Branches     1363     1367       +4     
==========================================
+ Hits        11385    11402      +17     
- Misses         38       45       +7     
- Partials       26       31       +5     

Flag	Coverage Δ
unittests	99.33% <100.00%> (-0.11%)	⬇️

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