Verifies common usecases for trimdefault/applydefault functions:
* open structure should be kept when fields not present

-- CUE --
#ListA: {
  datasource: "gdev-postgres"
  hide: number | *0
  includeAll : bool | *true
  label: string | *"Datacenter"
}
#ListB: {
  datasource: "gdev-mysql"
  hide: number | *1
  includeAll : bool | *false
  label: string | *"Datacenter"
}
#ListC: {
  datasource: !=""
  hide: number | *2
  includeAll : bool | *false
  label: string | *"Awesome"
}
{ 
  templating?: list: [...#ListA | #ListB | #ListC]
}

-- Full --
{
  "templating": {
    "list": [
      {
        "datasource": "gdev-postgres",
        "hide": 0,
        "includeAll": false,
        "label": "Datacenter"
      },
      {
        "datasource": "gdev-mysql",
        "hide": 0,
        "includeAll": false,
        "label": "Datacenter" 
      },
      {
        "datasource": "gdev-random",
        "hide": 2,
        "includeAll": false,
        "label": "Datacenter" 
      }
    ]
  }
}

-- Trimmed --
{
  "templating": {
    "list": [
      {
        "datasource": "gdev-postgres",
        "includeAll": false
      },
      {
        "datasource": "gdev-mysql",
        "hide": 0
      },
      {
        "datasource": "gdev-random",
        "label": "Datacenter" 
      }
    ]
  }
}