be <i>exact</i> or <i>loose</i>.
As unification recursively descends a composite type structure,
the matching mode used for elements of the type, the <i>element matching mode</i>,
remains the same as the matching mode except when two types are unified for
<a href="#Assignability">assignability</a> (<code>≡<sub>A</sub></code>):
in this case, the matching mode is <i>loose</i> at the top level but

### Bug or Regression

- Fix a scheduler preemption issue where the victim pod was not deleted due to incorrect status patching. This issue occurred when the preemptor and victim pods had different QoS classes in their status, causing the preemption to fail entirely. ([#126691](https://github.com/kubernetes/kubernetes/pull/126691), [@Huang-Wei](https://github.com/Huang-Wei)) [SIG Scheduling]

- The Kubernetes API server now correctly detects and closes existing TLS connections when its client certificate file for kubelet authentication has been rotated. ([#115567](https://github.com/kubernetes/kubernetes/pull/115567), [@enj](https://github.com/enj)) [SIG API Machinery, Node and Testing]

- The Kubernetes API server now correctly detects and closes existing TLS connections when its client certificate file for kubelet authentication has been rotated. ([#115566](https://github.com/kubernetes/kubernetes/pull/115566), [@enj](https://github.com/enj)) [SIG API Machinery, Node and Testing]

### Bug or Regression

- Fix a scheduler preemption issue where the victim pod was not deleted due to incorrect status patching. This issue occurred when the preemptor and victim pods had different QoS classes in their status, causing the preemption to fail entirely. ([#126695](https://github.com/kubernetes/kubernetes/pull/126695), [@Huang-Wei](https://github.com/Huang-Wei)) [SIG Scheduling]