I have a packer recipe that uses var files to fill in account-specific 
parameters at various parts of the build process.  This allows us to use 
the same build across multiple accounts from the same source code repo.

I was very happy to discover the "region_kms_key_ids 
<https://www.packer.io/docs/builders/amazon-ebs.html#region_kms_key_ids>" 
parameter, as this will remove an in-house process for distributing the 
packer-built AMI across the regions we utilize.  I would like our var files 
to look something like this:

{
  "somevar": "someval",
  "kms_key_ids_by_region": {
    "us-east-1": "keyid",
    [...]
   }
}

However I have run into a snag, with the issue 
https://github.com/hashicorp/packer/issues/2441 and the error "Error 
reading variables in 'test.json': json: cannot unmarshal object into Go 
value of type string"  It looks like putting maps into a variable file is 
not a supported operation.  My questions are, is there any timeline for 
fixing this?  Is there a recommended workaround?  Having a separate 
manifest per account is a pretty bad DRY violation.

Thanks!
--Alex

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