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This adds support for semantic version comparison to the CEL support in the "named resources" structured parameter model. For example, it can be used to check that an instance supports a certain API level. To minimize the risk, the new "semver" type is only defined in the CEL environment for DRA expressions, not in the base library. See https://github.com/kubernetes/kubernetes/pull/123664 for a PR which adds it to the base library. Validation of semver strings is done with the regular expression from semver.org. The actual evaluation at runtime then uses semver/v4.