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542e187831
ContentNegotiationManagerFactoryBean now ensures that ContentNegotiationManager contains the MediaType mappings even if the path extension and the parameter strategies are off. There are also minor fixes to ensure the media type mappings in ContentNegotiationManagerFactoryBean aren't polluted when mapping keys are not lowercase, and likewise MappingMediaTypeFileExtensionResolver filters out duplicates in the list of all file extensions. See gh-24179