This is not passed as a parameter to the `FastAPI` class to avoid
                giving the false idea that FastAPI would generate a different OpenAPI
                schema. It is only available as an attribute.

                **Example**

                ```python
                from fastapi import FastAPI

                app = FastAPI()

                app.openapi_version = "3.0.2"

        if read_with_orm_mode:
            # Let from_orm extract the data from this model instead of converting
            # it now to a dict.
            # Otherwise, there's no way to extract lazy data that requires attribute
            # access instead of dict iteration, e.g. lazy relationships.
            return res
        return _model_dump(
            res,
            by_alias=True,
            exclude_unset=exclude_unset,