class Model(BaseModel):
        foo: str

    non_cached_fields = get_model_fields(Model)
    non_cached_fields2 = get_model_fields(Model)
    cached_fields = get_cached_model_fields(Model)
    cached_fields2 = get_cached_model_fields(Model)
    for f1, f2 in zip(cached_fields, cached_fields2):
        assert f1 is f2

    assert non_cached_fields is not non_cached_fields2

    Undefined,
    _regenerate_error_with_loc,
    copy_field_info,
    create_body_model,
    evaluate_forwardref,
    field_annotation_is_scalar,
    get_annotation_from_field_info,
    get_cached_model_fields,
    get_missing_field_error,
    is_bytes_field,
    is_bytes_sequence_field,
    is_scalar_field,
    is_scalar_sequence_field,
    is_sequence_field,
    is_uploadfile_or_nonable_uploadfile_annotation,

        is_uploadfile_or_nonable_uploadfile_annotation(sub_annotation)
        for sub_annotation in get_args(annotation)
    )


@lru_cache
def get_cached_model_fields(model: Type[BaseModel]) -> List[ModelField]: