## 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))

- When creating a networking.k8s.io/v1 Ingress API object, `spec.rules[*].http` values are now validated consistently when the `host` field contains a wildcard. ([#93954](https://github.com/kubernetes/kubernetes/pull/93954), [@Miciah](https://github.com/Miciah)) [SIG CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Storage and Testing]...

    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

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