openapi: 3.0.0
components:
  schemas:
    A:
      description: a schema
      type: string
      format: byte
    oneOfError:
      description: should be array but instead just a ref
      oneOf:
        $ref: '#/components/schemas/A'
    allOfError:
      description: should be array but instead just a type
      allOf:
        type: string
    anyOfError:
      description: should be array but instead just a ref
      anyOf:
        $ref: '#/components/schemas/A'