{
  "matrix": {
    "options": {
      "testoption": [{ "val": "A string with spaces" }],
      "other_one":  [{ "val": "true"                 }],
      "combo_opt":  [{ "val": "one"                  }],
      "werror":     [{ "val": "true"                 }]
    }
  }
}