fix: OAS 3.1 multi type (cast/deserialize)

[litteratum]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.80%. Comparing base (37f1f46) to head (355ce5b).
⚠️ Report is 271 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1181      +/-   ##
==========================================
- Coverage   90.58%   89.80%   -0.79%     
==========================================
  Files         150      150              
  Lines        4387     4961     +574     
  Branches      534      410     -124     
==========================================
+ Hits         3974     4455     +481     
- Misses        320      404      +84     
- Partials       93      102       +9     

Flag	Coverage Δ
contrib	75.22% <100.00%> (?)
py3.10	75.22% <100.00%> (?)
py3.11	75.22% <100.00%> (?)
py3.12	75.22% <100.00%> (?)
py3.13	75.22% <100.00%> (?)
py3.14	75.04% <100.00%> (?)

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