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Why does this work?
```cluster_user_name = pulumi.Output.all(mdba_cluster_name).apply( lambda x: x )
pulumi.export( "cluster_user_name", cluster_user_name )```
But this:
```cluster_user_name = pulumi.Output.all(mdba_cluster_name).apply( lambda x: str( x + "foo" ) )
pulumi.export( "cluster_user_name", cluster_user_name )```