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I'm trying to extend the RabbitMQ `AbstractRoutingConnectionFactory` and override `getTargetConnectionFactory`.  My function signature is just `override fun getTargetConnectionFactory(lookupKey: Any?): ConnectionFactory?` but the compiler is rejecting that, and only accepts `override fun getTargetConnectionFactory(lookupKey: Any): ConnectionFactory`. Looking at how `getTargetConnectionFactory` is used, it can clearly accept a null `lookupKey` and return a null `ConnectionFactory` . Am I missing something obvious here? I don't see any nullability annotations on `getTargetConnectionFactory` `AbstractRoutingConnectionFactory` or any `package-info.java` that specifies package-wide null behavior. Spring Boot 3.4.3, spring-rabbit 3.2.3, Kotlin 1.9.23.