- github.com/envoyproxy/go-control-plane: [49ff273 → 9239064](https://github.com/envoyproxy/go-control-plane/compare/49ff273...9239064)
- github.com/envoyproxy/protoc-gen-validate: [v0.1.0 → v0.10.1](https://github.com/envoyproxy/protoc-gen-validate/compare/v0.1.0...v0.10.1)
- github.com/golang/glog: [v1.0.0 → v1.1.0](https://github.com/golang/glog/compare/v1.0.0...v1.1.0)

Continuous integration builds use Docker versions 1.11.2, 1.12.6, 1.13.1,
and 17.03.2. These versions were validated on Kubernetes 1.8. However,
consult an appropriate installation or upgrade guide before deciding what
versions of Docker to use.

- Docker 1.13.1 and 17.03.2

    - Shared PID namespace, live-restore, and overlay2 were validated.

    - **Known issues**

- github.com/envoyproxy/go-control-plane: [v0.10.3 → v0.11.1](https://github.com/envoyproxy/go-control-plane/compare/v0.10.3...v0.11.1)
- github.com/envoyproxy/protoc-gen-validate: [v0.9.1 → v1.0.2](https://github.com/envoyproxy/protoc-gen-validate/compare/v0.9.1...v1.0.2)
- github.com/evanphx/json-patch: [v5.6.0+incompatible → v4.12.0+incompatible](https://github.com/evanphx/json-patch/compare/v5.6.0...v4.12.0)

- github.com/go-openapi/strfmt: [v0.19.3 → v0.19.5](https://github.com/go-openapi/strfmt/compare/v0.19.3...v0.19.5)
- github.com/go-openapi/validate: [v0.19.5 → v0.19.8](https://github.com/go-openapi/validate/compare/v0.19.5...v0.19.8)
- github.com/gogo/protobuf: [v1.3.1 → v1.3.2](https://github.com/gogo/protobuf/compare/v1.3.1...v1.3.2)

[CRD Validation Expression Language](https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/2876-crd-validation-expression-language/README.mdv) is promoted to beta, which makes it possible to declare how custom resources are validated using the [Common Expression Language (CEL)](https://github.com/google/cel-spec). Please see the [validation rules](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/#validation-rules) guide.

RuleMemberValidator { public static final RuleMemberValidator CLASS_RULE_VALIDATOR; public static final RuleMemberValidator RULE_VALIDATOR; public static final RuleMemberValidator CLASS_RULE_METHOD_VALIDATOR; public static final RuleMemberValidator RULE_METHOD_VALIDATOR; private final Class annotation; private final boolean methods; private final java.util.List validatorStrategies; void RuleMemberValidator(RuleMemberValidator$Builder); public void validate(org.junit.runners.model.TestClass, java.util.List); private...

- On compatible systems, a mounter's Unmount implementation is changed to not return an error when the specified target can be detected as not a mount point. On Linux, the behavior of detecting a mount point depends on `umount` command is validated when the mounter is created. Additionally, mount point checks will be skipped in CleanupMountPoint/CleanupMountWithForce if the mounter's Unmount having the changed behavior of not returning error when target is not a mount point. ([#109676](htt...

- github.com/envoyproxy/go-control-plane: [49ff273 → 9239064](https://github.com/envoyproxy/go-control-plane/compare/49ff273...9239064)
- github.com/envoyproxy/protoc-gen-validate: [v0.1.0 → v0.10.1](https://github.com/envoyproxy/protoc-gen-validate/compare/v0.1.0...v0.10.1)
- github.com/golang/glog: [v1.0.0 → v1.1.0](https://github.com/golang/glog/compare/v1.0.0...v1.1.0)

  // means that this volume does not belong to any StorageClass.
  // +optional
  optional string storageClassName = 6;

  // mountOptions is the list of mount options, e.g. ["ro", "soft"]. Not validated - mount will
  // simply fail if one is invalid.
  // More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes/#mount-options
  // +optional
  repeated string mountOptions = 7;

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