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I was excited to get an email from Pulumipus about how aws crosswalk makes managing VPCs easier... however, I was disappointed to find getting a subnet type in a particular AZ is still based on the order of the array.  e.g. `pulumi.ouput(vpc.publicSubnetIds)[0]` would get the public subnet from the "first" AZ.

Also, are private and public subnets still required on <https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/awsx/ec2/#ExistingVpcIdArgs> ?

They look optional, but I can't find anything in the CHANGELOG that clarifies this.