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Hi, how should I pass a nested structure with array of outputs from resources? Example:

```
const samlProvider = new aws.iam.SamlProvider('saml_provider', {...})

const oktaAssumePolicy = pulumi.output(aws.iam.getPolicyDocument({
  statements: [{
    principals: [{
      type: "Federated",
      identifiers: [samlProvider.arn]
    }]
  }]
}))
```

Note the `statements-&gt;principals-&gt;identifiers`

It fails with ` Error: invocation of aws:iam/getPolicyDocument:getPolicyDocument returned an error: grpc: error while marshaling: proto: repeated field Values has nil element`

Ok, seems like I should use `pulumi.all({ statements: ...})` is that the correct approach?