Tags are not formatted as an array

[Sebastix]

When you try to publish an event with tags, the tags are not formatted as a array in the serialized string:

{
  ...
  "tags": {
     "title":"Long form content title test"
  }
}

which should be formatted to:

{
  ...
  "tags": [
     ["title", "Long form content title test"]
  ]
}