[bugfix] Suppress unsafe type check warning #473
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This fix removes a warning, which happens for Magnolia usages on generic types in case class params. The casting is generally safe except when there are default values overridden with different type, which is probably a very rare situation. A proper fix would require a broader change, touching the way default values are resolved, which doesn't seem worth pursuing at the moment. For the record, I added a commented test to reflect this case.