Model with recursive items cause RecursionError about openapi-core

[phrfpeixoto]

I've just hit this road block with simple users/groups models:

schemas:
  Group:
    type: object
    required:
      - id
      - users
    properties:
      id:
        type: string
        format: uuid
        readOnly: true
      users:
        type: array
        items:
          $ref: '#/components/schemas/User'
  User:
    type: object
    required:
      - id
      - groups
    properties:
      id:
        type: string
        format: uuid
        readOnly: true
      groups:
        type: array
        items:
          $ref: '#/components/schemas/Group'

I quickly checked the code and it seems that references are not held. Instead the code dereferences every single $ref and replaces it with an instance of Schema, so I did not see any practical way of fixing this.

On this case it was easier to work around, by removing the property on one of the models.