Support multiple encodings

[Dreamsorcerer]

AI draft. Putting this here to come back to it sometime. Too much to deal with right now.

Fixes #13364

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.00%. Comparing base (d041d4d) to head (8c5d94e).
⚠️ Report is 12 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #13400    +/-   ##
========================================
  Coverage   98.99%   99.00%            
========================================
  Files         132      132            
  Lines       49454    49583   +129     
  Branches     2572     2585    +13     
========================================
+ Hits        48959    49088   +129     
  Misses        371      371            
  Partials      124      124            

Flag	Coverage Δ
Autobahn	22.07% <17.33%> (-0.01%)	⬇️
CI-GHA	98.91% <100.00%> (+<0.01%)	⬆️
OS-Linux	98.68% <100.00%> (+<0.01%)	⬆️
OS-Windows	97.04% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.94% <100.00%> (+<0.01%)	⬆️
Py-3.10	98.14% <100.00%> (+<0.01%)	⬆️
Py-3.11	98.39% <100.00%> (+<0.01%)	⬆️
Py-3.12	98.48% <100.00%> (+<0.01%)	⬆️
Py-3.13	98.46% <100.00%> (+<0.01%)	⬆️
Py-3.14	98.48% <100.00%> (+<0.01%)	⬆️
Py-3.14t	97.57% <100.00%> (+<0.01%)	⬆️
Py-pypy-3.11	97.42% <99.33%> (-0.01%)	⬇️
VM-macos	97.94% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	98.68% <100.00%> (+<0.01%)	⬆️
VM-windows	97.04% <100.00%> (+<0.01%)	⬆️
cython-coverage	38.31% <100.00%> (+0.16%)	⬆️

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[codspeed-hq]

Merging this PR will not alter performance

✅ 84 untouched benchmarks
⏩ 83 skipped benchmarks¹

---

_{Comparing multiple-codings (8c5d94e) with master (840c5e3)²}

Footnotes

1. 83 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. ↩

2. No successful run was found on master (d041d4d) during the generation of this report, so 840c5e3 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩