Not sure if root properties next to 'allOf' make sense

[postatum]

This applied to anyOf/oneOf/allOf.
Having RAML type:

Cat:
  type: object
  maxProperties: 1
  properties:
    rating:
      type: string | integer

Canonical form will be:

{
  "additionalProperties": true,
  "maxProperties": 1,
  "type": "union",
  "anyOf": [
    {
      "properties": {
        "rating": {
          "type": "string",
          "required": true
        }
      },
      "additionalProperties": true,
      "maxProperties": 1,
      "type": "object"
    },
    {
      "properties": {
        "rating": {
          "type": "integer",
          "required": true
        }
      },
      "additionalProperties": true,
      "maxProperties": 1,
      "type": "object"
    }
  ]
}

As you can see, schemas in anyOf duplicate all params of root object like maxProperties.
Considering that using union adds multiple copies of that object to anyOf and to be valid instance has to be valid to any of them, does it make sense to keep root properties when anyOf is present?
As I imagine it maxProperties or additionalProperties will not be used in validation, because instance will be validated against schemas from anyOf.
I may be wrong here.