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From the doc
```// Create a VPC for our cluster.
const vpc = new awsx.ec2.Vpc("my-vpc");
const allVpcSubnets = vpc.privateSubnetIds.concat(vpc.publicSubnetIds);```
`awsx.ec2.Vpc` is expecting a second args so this will not work
`vpc.privateSubnetIds` is a promise and you can’t concat Promises. What is going on? Is this doc outdated?