Core schema improvements

[samuelcolvin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #265 (b8a132c) into main (bb13fda) will increase coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #265      +/-   ##
==========================================
+ Coverage   98.59%   98.61%   +0.02%     
==========================================
  Files          51       51              
  Lines        5330     5342      +12     
  Branches       39       39              
==========================================
+ Hits         5255     5268      +13     
+ Misses         75       74       -1     

Impacted Files	Coverage Δ
pydantic_core/core_schema.py	100.00% <100.00%> (+0.31%)	⬆️

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