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Add tests to cover all enum scenarios for OpenAPI (#67485)
Populate XML doc comments into OpenAPI document (#60326)
Map [Obsolete] attribute to deprecated in OpenAPI documents (#66355)
MVC+OpenAPI: Support multiple `Produces` for same status code / content-type (#65650)
Support nullable array element types in parameter schemas (#68250)
ApiExplorer and OpenAPI unions support (#67001)