Kubernetes 1.8 caused the API server to accept a request with incorrect case and coerce it to correct case, but this behaviour has been fixed in 1.11 and the API server will once again be enforcing the correct case. It’s worth noting that during this time, the `kubectl` tool continued to enforce case-sensitive keys, so users that strictly manage resources with `kubectl` will be unaffected by this change. ([#65034](https://github.com/kubernetes/kubernetes/pull/65034), [@caesarxuchao](https://github.com/caesarxuchao))...

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