Drop RequestKey/ResponseKey warnings in v4

[Dreamsorcerer]

For performance edge cases, we probably want to drop these again once users have had a chance to be notified of the change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.73%. Comparing base (3005510) to head (59776ea).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11776      +/-   ##
==========================================
- Coverage   98.74%   98.73%   -0.02%     
==========================================
  Files         127      127              
  Lines       43856    43823      -33     
  Branches     2334     2332       -2     
==========================================
- Hits        43307    43270      -37     
- Misses        389      392       +3     
- Partials      160      161       +1     

Flag	Coverage Δ
CI-GHA	98.60% <ø> (-0.02%)	⬇️
OS-Linux	98.33% <ø> (-0.01%)	⬇️
OS-Windows	96.67% <ø> (-0.01%)	⬇️
OS-macOS	97.56% <ø> (-0.01%)	⬇️
Py-3.10.11	97.10% <ø> (-0.01%)	⬇️
Py-3.10.19	97.60% <ø> (-0.01%)	⬇️
Py-3.11.14	97.80% <ø> (-0.01%)	⬇️
Py-3.11.9	97.31% <ø> (-0.01%)	⬇️
Py-3.12.10	97.41% <ø> (-0.01%)	⬇️
Py-3.12.12	97.90% <ø> (-0.01%)	⬇️
Py-3.13.9	98.15% <ø> (-0.01%)	⬇️
Py-3.14.0	98.11% <ø> (-0.01%)	⬇️
Py-3.14.0t	97.18% <ø> (-0.02%)	⬇️
Py-pypy3.11.13-7.3.20	97.40% <ø> (-0.02%)	⬇️
VM-macos	97.56% <ø> (-0.01%)	⬇️
VM-ubuntu	98.33% <ø> (-0.01%)	⬇️
VM-windows	96.67% <ø> (-0.01%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging #11776 will not alter performance

_{Comparing Dreamsorcerer-patch-6 (59776ea) with master (3005510)}

Summary

✅ 59 untouched