app = FastAPI()

@app.get("/items/invalidnone", response_model=Union[Item, None])
def get_invalid_none():
    return None
```

This way the data will be correctly validated, you won't have an internal server error, and the documentation will also reflect that this *path operation* could return `None` (or `null` in JSON).

### Fixes

    e.g., setting the environment variable `TF_ENABLE_MKL_NATIVE_FORMAT` will
    not have any effect.

*   TensorFlow has been validated on Windows Subsystem for Linux 2 (aka WSL 2)
    for both GPUs and CPUs.

*   Due to security issues (see section below), all boosted trees code has been
    deprecated. Users should switch to

- The list of validated docker versions remains unchanged.
  - The current list is 1.13.1, 17.03, 17.06, 17.09, 18.06, 18.09. ([#72823](https://github.com/kubernetes/kubernetes/pull/72823), [#72831](https://github.com/kubernetes/kubernetes/pull/72831))

## External Dependencies
* The supported etcd server version is 3.1.12, as compared to 3.1.10 in v1.9 ([#60998](https://github.com/kubernetes/kubernetes/pull/60998))
* The validated docker versions are the same as for v1.9: 1.11.2 to 1.13.1 and 17.03.x ([ref](https://github.com/kubernetes/kubernetes/blob/release-1.10/test/e2e_node/system/docker_validator_test.go))

Kubernetes supports node proxying, which allows clients of kube-apiserver to access endpoints of a Kubelet to establish connections to Pods, retrieve container logs, and more. While Kubernetes already validates the proxying address for Nodes, a bug in kube-apiserver made it possible to bypass this validation. Bypassing this validation could allow authenticated requests destined for Nodes to be redirected to the API Server through its private network.

   limitations under the License.

================================================================

github.com/go-openapi/validate
https://github.com/go-openapi/validate
----------------------------------------------------------------

                                 Apache License
                           Version 2.0, January 2004

pkg crypto/rsa, func VerifyPKCS1v15(*PublicKey, crypto.Hash, []uint8, []uint8) error
pkg crypto/rsa, method (*PrivateKey) Precompute()
pkg crypto/rsa, method (*PrivateKey) Validate() error
pkg crypto/rsa, type CRTValue struct
pkg crypto/rsa, type CRTValue struct, Coeff *big.Int
pkg crypto/rsa, type CRTValue struct, Exp *big.Int
pkg crypto/rsa, type CRTValue struct, R *big.Int