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kotlinlang

Got a weird issue with a `@JsonCreator` annotation: it complains that one parameter is missing, but the parameter isn't marked as required in the creator and is indeed a `String?`, so may be null.
Debugging this made me scratch my head quite a bit - during startup jackson correctly detects the creator and says no property is required. But then turns around and loses that information. Can't quite figure out how for now. Did this happen to somebody else?