add validator_instance to function validators

[samuelcolvin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #258 (28b3e4b) into main (562b74e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #258   +/-   ##
=======================================
  Coverage   98.60%   98.60%           
=======================================
  Files          51       51           
  Lines        5227     5229    +2     
  Branches       37       37           
=======================================
+ Hits         5154     5156    +2     
  Misses         73       73           

Impacted Files	Coverage Δ
pydantic_core/core_schema.py	100.00% <100.00%> (ø)

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