- Adds the ability to pass --strict-transport-security-directives to the kube-apiserver to set the HSTS header appropriately.  Be sure you understand the consequences to browsers before setting this field. ([#96502](https://github.com/kubernetes/kubernetes/pull/96502), [@249043822](https://github.com/249043822))...

- Fixed bug that caused a resource to include patch directives when using strategic merge patch against a non-existent field. ([#117568](https://github.com/kubernetes/kubernetes/pull/117568), [@alexzielenski](https://github.com/alexzielenski))

  - setcap:bullseye-v1.3.0 ([#110558](https://github.com/kubernetes/kubernetes/pull/110558), [@wespanther](https://github.com/wespanther))
- When using the OpenStack legacy cloud provider, kubelet and KCM will ignore unknown configuration directives rather than failing to start. ([#109709](https://github.com/kubernetes/kubernetes/pull/109709), [@mdbooth](https://github.com/mdbooth))

  - `CustomPodDNS`
  - `HugePages`
  - `MountPropagation`
  - `PersistentLocalVolumes`
- CoreDNS: The following directives or keywords are deprecated and will be removed in v1.15:
  - `upstream` option of `kubernetes` plugin, becoming default behavior in v1.15.
  - `proxy` plugin replaced by `forward` plugin

      * `kubectl edit` and `kubectl apply` will keep the ordering of elements in merged lists ([#45980](https://github.com/kubernetes/kubernetes/pull/45980), [@mengqiy](https://github.com/mengqiy))

      * New patch directive (retainKeys) to specifying clearing fields missing from the request ([#44597](https://github.com/kubernetes/kubernetes/pull/44597), [@mengqiy](https://github.com/mengqiy))

  
  When we switched to go-runner for building the apiserver,
  controller-manager, and scheduler server components, we no longer
  reference the individual architectures in the image names, specifically
  in the 'FROM' directive of the server image Dockerfiles.
  
  As a result, server images for non-amd64 images copy in the go-runner
  amd64 binary instead of the go-runner that matches that architecture.
  

* Add generic Toleration for NoExecute Taints to NodeProblemDetector ([#45883](https://github.com/kubernetes/kubernetes/pull/45883), [@gmarek](https://github.com/gmarek))
* support replaceKeys patch strategy and directive for strategic merge patch ([#44597](https://github.com/kubernetes/kubernetes/pull/44597), [@mengqiy](https://github.com/mengqiy))

interface{ chan int | chan<- string }     // channels have different element types
interface{ <-chan int | chan<- int }      // directional channels have different directions
</pre>

<p>
Some operations (<a href="#Slice_expressions">slice expressions</a>,
<a href="#Appending_and_copying_slices"><code>append</code> and <code>copy</code></a>)