- Fixed bugs in handling of server-side apply, create, and update API requests for objects containing duplicate items in keyed lists.
  - A `create` or `update` API request with duplicate items in a keyed list no longer wipes out managedFields. Examples include env var entries with the same name, or port entries with the same containerPort in a pod spec.

    * `kubectl set selector` and `kubectl set subject` no longer print "running in local/dry-run mode..." at the top.  The output can now be piped and interpretted as yaml or json ([#46507](https://github.com/kubernetes/kubernetes/pull/46507), [@bboreham](https://github.com/bboreham))

## Changelog since v1.17.5

## Changes by Kind

### API Change
 - Fix bug where sending a status update completely wipes managedFields for some types. ([#90032](https://github.com/kubernetes/kubernetes/pull/90032), [@apelisse](https://github.com/apelisse)) [SIG API Machinery and Testing]

### Bug or Regression

    *   kubectl kustomize <somedir> has the same effect as kustomize build <somedir>
    * To build API resources from somedir with a kustomization.yaml file
    *    kubectl kustomize <somedir>
    * This command can be piped to apply or delete 
    *    kubectl kustomize <somedir> | kubectl apply -f -
    *    kubectl kustomize <somedir> | kubectl delete -f -

    * be created in 192.168.0.0./16 and 172.16.0.0/12 while preserving the container IPs (which would be lost before).
* `set selector` and `set subject` no longer print "running in local/dry-run mode..." at the top, so their output can be piped as valid yaml or json ([#46507](https://github.com/kubernetes/kubernetes/pull/46507), [@bboreham](https://github.com/bboreham))

## Changelog since v1.16.9

## Changes by Kind

### API Change
 - Fix bug where sending a status update completely wipes managedFields for some types. ([#90033](https://github.com/kubernetes/kubernetes/pull/90033), [@apelisse](https://github.com/apelisse)) [SIG API Machinery and Testing]

### Bug or Regression