Terragrunt: Yamldecode decodes all variables into string type

[bankinobi]

I'd like to use yaml formatted variables for terraform with terragrunt. But variables passed to terraform are all with string type, but source vars are all have different types.

Current working tree

.
├── dns
│   └── terragrunt.hcl
├── dns-records.yaml
├── terragrunt.hcl
└── variables.yaml

dns-records.yaml contents

dns_zones:
  - name: "test-com"
    dns_name: "test.com."

dns_records:
  test-com:
    - name: "anothertest"
      type: "CNAME"
      rrdatas: ["test.com."]

variables.yaml contents

#Test variable
test: "supertest"

Parent terragrunt.hcl

inputs = yamldecode(file("variables.yaml"))

Terragrunt.hcl in dns folder

include {
  path = find_in_parent_folders()
}
terraform {
  source = "/home/bankinobi/work/terraform-modules/dns"
}

inputs = yamldecode(file("${find_in_parent_folders("dns-records.yaml")}"))

Here is my tfstate after refreshing outputs in source module:

{
  "version": 4,
  "terraform_version": "0.12.28",
  "serial": 9,
  "lineage": "4d9e1f5d-aa1f-1d6f-2eba-173f2f91f4ef",
  "outputs": {
    "records": {
      "value": "{\"test-com\":[{\"name\":\"anothertest\",\"rrdatas\":[\"test.com.\"],\"type\":\"CNAME\"}]}",
      "type": "string"
    },
    "test": {
      "value": "supertest",
      "type": "string"
    },
    "zones": {
      "value": "[{\"dns_name\":\"test.com.\",\"name\":\"test-com\"}]",
      "type": "string"
    }
  },
  "resources": []
}

How can i decode yamls with preserving variables types?

[yorinasub17]

This is the same issue as https://github.com/gruntwork-io/terragrunt/issues/1007, https://github.com/gruntwork-io/terragrunt/issues/997, and https://github.com/gruntwork-io/terragrunt/issues/1002. You need to add the type information to the variables in terraform to get it to decode properly.

[bankinobi]

Thank you so much for your help.