Draft post type

[cuibonobo]

This may have to be a "core" post type, since it requires a unique way to interpret the type, but maybe not. The schema of the type would be something like:

{
  "type": "string",
  "content": {
    "values": {}
  }
}

That is, the content key of the post will itself have a type and content that reflect the kind of post that this is a draft of. As a result, the parser would need to look at the content in order to enforce a particular schema.