>
  <user>carl</user>
  <user>doug</user>
</top>
Bock % /tmp/foo --libxo:JP
{
  "top": {
    "test": [
      {
        "user": "alice"
      },
      {
        "user": "bob"
      },
      {
        "user": "carl"
      },
      {
        "user": "doug"
      }
    ]
  }
}
Bock % /tmp/foo --libxo:JP yes
{
  "top": {
    "user": [
      "alice",
      "bob",
      "carl",
      "doug"
    ]
  }
}