Describe the bug

When generating documentation of terraform code that contains an object variable where one of the properties is a list which contains a default, terraform docs is not able to generate the docs and returns this error.

Error: gob: type not registered for interface: []interface {}

How can we reproduce it?

Clone the tfdocs-format-template. Then, create a terraform code that contains a variable such as this one

variable "some_variable" {
  description = "some description"
  type = object({
    property = list(string)
  })
  default = {
    property = [] # or ["any_string"]
  }
}

Finally try to generate the documentation from that using the custom plugin.

Environment information

❯ terraform-docs --version
terraform-docs version v0.17.0 darwin/arm64

❯ go version
go version go1.22.3 darwin/arm64