DNM: Benchmark overhead of setdefault calls in _prepare_headers

[bdraco]

#2779 (comment)

[codspeed-hq]

CodSpeed Performance Report

Merging #9898 will not alter performance

_{Comparing prepare_headers_setdefault (a1cfe90) with master (5ab2d47)}

Summary

✅ 25 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.71%. Comparing base (5ab2d47) to head (a1cfe90).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
aiohttp/web_response.py	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9898      +/-   ##
==========================================
- Coverage   98.71%   98.71%   -0.01%     
==========================================
  Files         119      119              
  Lines       36371    36373       +2     
  Branches     4320     4322       +2     
==========================================
+ Hits        35903    35904       +1     
  Misses        315      315              
- Partials      153      154       +1     

Flag	Coverage Δ
CI-GHA	98.60% <83.33%> (-0.01%)	⬇️
OS-Linux	98.28% <83.33%> (-0.01%)	⬇️
OS-Windows	96.09% <83.33%> (-0.01%)	⬇️
OS-macOS	97.36% <83.33%> (-0.01%)	⬇️
Py-3.10.11	97.22% <83.33%> (-0.01%)	⬇️
Py-3.10.15	97.82% <83.33%> (-0.01%)	⬇️
Py-3.11.10	97.81% <83.33%> (-0.01%)	⬇️
Py-3.11.9	97.26% <83.33%> (-0.01%)	⬇️
Py-3.12.7	98.35% <83.33%> (+<0.01%)	⬆️
Py-3.13.0	98.34% <83.33%> (+<0.01%)	⬆️
Py-3.9.13	97.14% <83.33%> (+<0.01%)	⬆️
Py-3.9.20	97.69% <83.33%> (-0.05%)	⬇️
Py-pypy7.3.16	97.30% <83.33%> (-0.01%)	⬇️
VM-macos	97.36% <83.33%> (-0.01%)	⬇️
VM-ubuntu	98.28% <83.33%> (-0.01%)	⬇️
VM-windows	96.09% <83.33%> (-0.01%)	⬇️

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[bdraco]

no difference