- Kubeadm: improve the strict parsing of user YAML/JSON configuration files. Next to printing warnings for unknown and duplicate fields (current state), also print warnings for fields with incorrect case sensitivity - e.g. `controlPlaneEndpoint` (valid), `ControlPlaneEndpoint` (invalid). Instead of only printing warnings during `init` and `join` also print warnings when downloading the ClusterConfiguration, KubeletConfiguration or KubeProxyConfiguration objects...

### Bug or Regression

- Fix NodeAuthenticator tests in dualstack ([#104840](https://github.com/kubernetes/kubernetes/pull/104840), [@ardaguclu](https://github.com/ardaguclu)) [SIG Auth and Testing]
- Fix: skip case sensitivity when checking Azure NSG rules
  fix: ensure InstanceShutdownByProviderID return false for creating Azure VMs ([#104447](https://github.com/kubernetes/kubernetes/pull/104447), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

- Fix: skip case sensitivity when checking Azure NSG rules
  fix: ensure InstanceShutdownByProviderID return false for creating Azure VMs ([#104446](https://github.com/kubernetes/kubernetes/pull/104446), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

## Changes by Kind

### Bug or Regression

- Fix: skip case sensitivity when checking Azure NSG rules
  fix: ensure InstanceShutdownByProviderID return false for creating Azure VMs ([#104448](https://github.com/kubernetes/kubernetes/pull/104448), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

- Fix: skip case sensitivity when checking Azure NSG rules
  fix: ensure InstanceShutdownByProviderID return false for creating Azure VMs ([#104449](https://github.com/kubernetes/kubernetes/pull/104449), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

            PropertyConfiguration config = new PropertyConfiguration(props);
            assertEquals(strategy, config.getLoadBalancingStrategy());
        }

        // Test case insensitivity
        props.setProperty("jcifs.smb.client.loadBalancingStrategy", "ADAPTIVE");
        PropertyConfiguration config = new PropertyConfiguration(props);
        assertEquals("ADAPTIVE", config.getLoadBalancingStrategy());

	if _, ok := formValues[xhttp.AmzSignatureV2]; ok {
		delete(mustFindInPolicy, xhttp.AmzSignatureV2)
		for k := range mustFindInPolicy {
			// case-insensitivity for AWSAccessKeyId
			if strings.EqualFold(k, xhttp.AmzAccessKeyID) {
				delete(mustFindInPolicy, k)
				break
			}
		}
	}

	return Replace(s, old, new, -1)
}

// EqualFold reports whether s and t, interpreted as UTF-8 strings,
// are equal under simple Unicode case-folding, which is a more general
// form of case-insensitivity.
func EqualFold(s, t []byte) bool {
	// ASCII fast path
	i := 0
	for n := min(len(s), len(t)); i < n; i++ {
		sr := s[i]
		tr := t[i]
		if sr|tr >= utf8.RuneSelf {
			goto hasUnicode
		}