Class Sub

tests/test_main.py:1543–1548

        ParentConfig.fields = {'b': {'exclude': ...}, 'd': {'exclude': {'a'}}}

    class Sub(BaseModel):
        a: list[int] = Field([3, 4, 5], exclude={1} if 'sub_fields' in kinds else None)
        b: int = Field(4, exclude=... if 'sub_fields' in kinds else None)
        c: str = 'foobar'

        Config = ChildConfig

    class Model(BaseModel):
        a: int = 0