FakeNumpyArray,
        WithJsonSchema(TypeAdapter(list[float]).json_schema()),
        PlainSerializer(lambda v: v.data),
    ]

    class MyModel(BaseModel):
        model_config = ConfigDict(arbitrary_types_allowed=True)
        custom_field: FakeNumpyArrayPydantic

    app = FastAPI()

    @app.get("/")
    def test() -> MyModel:
        return MyModel(custom_field=FakeNumpyArray())

    client = TestClient(app)

        model_config = {"arbitrary_types_allowed": True}

    test_path = PurePath("/foo", "bar")
    obj = ModelWithPath(path=test_path)
    assert jsonable_encoder(obj) == {"path": str(test_path)}


def test_encode_model_with_pure_posix_path():
    class ModelWithPath(BaseModel):
        path: PurePosixPath

        model_config = {"arbitrary_types_allowed": True}

        def __bool__(self):
            return False

    class EmbeddedModel(BaseModel):
        model_config = ConfigDict(arbitrary_types_allowed=True)
        value: Union[str, Missing] = Missing()

    class Model(BaseModel):
        model_config = ConfigDict(
            arbitrary_types_allowed=True,
        )
        value: Union[str, Missing] = Missing()
        embedded_model: EmbeddedModel = EmbeddedModel()

        with pytest.raises(TypeError):
            vars(asyncpg_uuid)
        return {"fast_uuid": asyncpg_uuid}

    class SomeCustomClass(BaseModel):
        model_config = {"arbitrary_types_allowed": True}

        a_uuid: MyUuid

        @field_serializer("a_uuid")
        def serialize_a_uuid(self, v):
            return str(v)

    @app.get("/get_custom_class")
    def return_some_user():

## 0.124.1

### Fixes

* 🐛 Fix handling arbitrary types when using `arbitrary_types_allowed=True`. PR [#14482](https://github.com/fastapi/fastapi/pull/14482) by [@tiangolo](https://github.com/tiangolo).

### Docs