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avoid getting default values from defaultdict #1853
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CodSpeed Performance Report
Merging #1853 will not alter performance
Comparing dh/defaultdict (11104ea) with main (eed392b)
Summary
✅ 163 untouched
Closed
1 task
Viicos
Viicos
approved these changes
Oct 27, 2025
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Change Summary
This changes the lookup strategy when passing dict subclasses as inputs to models to be equivalent of
input.get(field_name, PydanticUndefined), and then assumes the value is not present ifPydanticUndefinedis returned.Related issue number
Fixes pydantic/pydantic#12376
Checklist
pydantic-core(except for expected changes)