SecurityGroupIngress/Egress formatting with additional []

[yumpy]

I have defined a SecurityGroup with an 'embedded' Ingress rule

EC2_SecurityGroup(:mySG) {
  VpcId Ref(:VPC)
  GroupDescription "my SG"
  SecurityGroupIngress [
    {
      "CidrIp"     => "10.0.0.0/8",
      "IpProtocol" => "tcp",
      "FromPort"   => "22",
      "ToPort"     => "22"
    }
  ]
}  

The generated JSON for the Ingress contains an additional [ .... ] which is rejected by CloudFormation. This also happens for Egress as well. Note that the similar format NetworkInterfaces (in EC2_Instance) seems to work OK.

Generated:

            "SecurityGroupIngress" : [
               [
                  {
                     "FromPort" : "22",
                     "IpProtocol" : "tcp",
                     "CidrIp" : "10.0.0.0/8",
                     "ToPort" : "22"
                  }
               ]
            ]

should be:

            "SecurityGroupIngress" : [
                  {
                     "FromPort" : "22",
                     "IpProtocol" : "tcp",
                     "CidrIp" : "10.0.0.0/8",
                     "ToPort" : "22"
                  }
               ]

Removing the [ ...] from around

     SecurityGroupIngress: [ EC2SecurityGroupRule ]
     SecurityGroupEgress: [ EC2SecurityGroupRule ]

in aws_types.yaml seems to fix the problem for me but I don't think that's the correct approach

[yumpy]

Just noticed that this has already been raised as #72