Pydantic v2 patterns trending in 2025-26 FastAPI codebases.
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How does Pydantic v2 validation work (BaseModel, field_validator, mode)?
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pydanticvalidationpython3.11
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Pydantic v2 validates via Rust core (pydantic-core), with mode='before'/'after', Annotated types, and field_validator/model_validator.
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