Please, clarify for me:
The spec declare that:
document MUST contain at least one of the following top-level members:
data: the document’s “primary data”errors: an array of [error objects]meta: a [meta object] that contains non-standard meta-information.
I don’t found any mentions that it is only for responses.
Creating Resources
The request MUST include a single [resource object] as primary data. The [resource object] MUST contain at least atypemember.
These lines don’t say that request must contain only a single resource object
So is it will be ok to allow send some meta for post/patch requests?
POST /photos HTTP/1.1
Content-Type: application/vnd.api+json
Accept: application/vnd.api+json
{
  "data": {
    "type": "photos",
    "attributes": {
      "title": "Ember Hamster",
      "src": "http://example.com/images/productivity.png"
    },
    "meta": {
       "transform": false,
       "makeThumb: true
    }
  }
}