diagnosing swagger allOf

before.yaml

swagger: '2.0'
info:
  version: 1.0.0
  title: Example API
  description: |
    blabla
  termsOfService: Copyright TEST eG - 2015
  contact:
    name: info@example.de
  license:
    name: Example
    url: http://a.b/

host: localhost:58454
basePath: /test/api
schemes:
 - http
consumes:
 - application/json;charset=utf-8
produces:
 - application/json;charset=utf-8

paths:

  /core/v1/test/:
    post:
      summary: Test Summary
      description: foo
      parameters:
        - name: body
          in: body
          schema:
            allOf:
              - $ref: "#/definitions/PrimaryConfig"
              - type: "object"
                properties:
                  tacked_on_later:
                    type: "string"

      responses:
        '200':
          description: Success.
          headers:
            RequestId:
              type: string
              description: Request id
          schema:
            type: number

definitions:
  PrimaryConfig:
    type: object
    properties:
      first_main_property:
        type: string
      second_main_property:
        type: number

onlyref.yaml

swagger: '2.0'
info:
  version: 1.0.0
  title: Example API
  description: |
    blabla
  termsOfService: Copyright TEST eG - 2015
  contact:
    name: info@example.de
  license:
    name: Example
    url: http://a.b/

host: localhost:58454
basePath: /test/api
schemes:
 - http
consumes:
 - application/json;charset=utf-8
produces:
 - application/json;charset=utf-8

paths:

  /core/v1/test/:
    post:
      summary: Test Summary
      description: foo
      parameters:
        - name: body
          in: body
          schema:
            allOf:
              - $ref: "#/definitions/PrimaryConfig"
              - $ref: "#/definitions/ExtraConfig"

      responses:
        '200':
          description: Success.
          headers:
            RequestId:
              type: string
              description: Request id
          schema:
            type: number

definitions:
  PrimaryConfig:
    type: object
    properties:
      first_main_property:
        type: string
      second_main_property:
        type: number
  ExtraConfig:
    type: object
    properties:
      tacked_on_later:
        type: "string"