field_info = FieldInfo(annotation=Union[list[str], None])
    field = v2.ModelField(name="items", field_info=field_info)
    result = v2.serialize_sequence_value(field=field, value=["a", "b", "c"])
    assert result == ["a", "b", "c"]
    assert isinstance(result, list)


@needs_py310
def test_serialize_sequence_value_with_optional_list_pipe_union():

    »»»

Some examples in Spanish:

    Source:

        «««
        /// tip
        »»»

    Result:

        «««
        /// tip | Consejo
        »»»

    Source:

        «««
        /// details | Preview
        »»»

    Result:

        «««
        /// details | Vista previa
        »»»


### Tab blocks

        if isinstance(route, routing.APIRoute):
            result = get_openapi_path(
                route=route,
                operation_ids=operation_ids,
                model_name_map=model_name_map,
                field_mapping=field_mapping,
                separate_input_output_schemas=separate_input_output_schemas,
            )
            if result:
                path, security_schemes, path_definitions = result

Examples:

    Source (English):

        «««
        "Hello world"
        “Hello Universe”
        "He said: 'Hello'"
        “my name is ‘Nils’”
        `"__main__"`
        `"items"`
        »»»

    Result (German):

        «««
        „Hallo Welt“
        „Hallo Universum“
        „Er sagte: ‚Hallo‘“
        „Mein Name ist ‚Nils‘“
        `"__main__"`
        `"items"`
        »»»


### Ellipsis

            the output should use the alias names (when provided) or the Python
            attribute names. In an API, if you set an alias, it's probably because you
            want to use it in the result, so you probably want to leave this set to
            `True`.
            """
        ),
    ] = True,
    exclude_unset: Annotated[
        bool,
        Doc(
            """

            results: list[Union[bytes, str]] = []

            async def process_fn(
                fn: Callable[[], Coroutine[Any, Any, Any]],
            ) -> None:
                result = await fn()
                results.append(result)  # noqa: B023

            async with anyio.create_task_group() as tg:
                for sub_value in value:
                    tg.start_soon(process_fn, sub_value.read)

    ml_models.clear()


app = FastAPI(lifespan=lifespan)


@app.get("/predict")
async def predict(x: float):
    result = ml_models["answer_to_everything"](x)
    return {"result": result}
```

**Note**: This is the recommended way going forward, instead of using `startup` and `shutdown` events.