<a href="#Predeclared_identifiers"><code>nil</code></a>;
that case is selected when the expression in the TypeSwitchGuard
is a <code>nil</code> interface value.
There may be at most one <code>nil</code> case.
</p>

<p>
Given an expression <code>x</code> of type <code>interface{}</code>,
the following type switch:
</p>

<pre>
switch i := x.(type) {
case nil:

  error as the real clients; in particular, a failed Get(), Create(), etc, no longer
  returns `nil`. (It now returns a pointer to a zero-valued object, like the real
  clients do.) This will break some downstream unit tests that were testing
  `result == nil` rather than `err != nil`, and in some cases may expose bugs

- Omit nil or empty field when calculating container hash value to avoid hash changed. For a new field with a non-nil default value in the container spec, the hash would still get changed. ([#57741](https://github.com/kubernetes/kubernetes/pull/57741), [@dixudx](https://github.com/dixudx))

## Changelog since v1.12.5

### Other notable changes

* kubeadm: fixed nil pointer dereference caused by a bug in url parsing ([#74454](https://github.com/kubernetes/kubernetes/pull/74454), [@bart0sh](https://github.com/bart0sh))

* Automated cherry pick of [#49259](https://github.com/kubernetes/kubernetes/pull/49259): update json-patch to fix nil value issue when creating mergepatch ([#59324](https://github.com/kubernetes/kubernetes/pull/59324), [@yue9944882](https://github.com/yue9944882))

- Updates that remove remaining `metadata.finalizers` from  an object that is pending deletion (non-nil metadata.deletionTimestamp) and has no graceful deletion pending (nil or 0 metadata.deletionGracePeriodSeconds) now results in immediate deletion of the object. ([#77952](https://github.com/kubernetes/kubernetes/pull/77952), [@liggitt](https://github.com/liggitt))

- Allowed `pvc.spec.VolumeAttributesClassName` to change from non-nil to nil. ([#132106](https://github.com/kubernetes/kubernetes/pull/132106), [@AndrewSirenko](https://github.com/AndrewSirenko))

- Fixed a bug in `ValidatingAdmissionPolicy` where schemas with `additionalProperties: true` could cause the kube-controller-manager to crash with a nil pointer exception. ([#135155](https://github.com/kubernetes/kubernetes/pull/135155), [@jpbetz](https://github.com/jpbetz))

- Avoid caching the Azure VMSS instances whose network profile is nil ([#100948](https://github.com/kubernetes/kubernetes/pull/100948), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

- Fix missing "apiVersion" for "involvedObject" in Events for Nodes. ([#87537](https://github.com/kubernetes/kubernetes/pull/87537), [@uthark](https://github.com/uthark)) [SIG Apps and Node]
- Fix nil pointer dereference in azure cloud provider ([#85975](https://github.com/kubernetes/kubernetes/pull/85975), [@ldx](https://github.com/ldx)) [SIG Cloud Provider]