properties:
                        allowCredentials:
                          description: Indicates whether the caller is allowed to
                            send the actual request (not the preflight) using credentials.
                          nullable: true
                          type: boolean
                        allowHeaders:

                      properties:
                        allowCredentials:
                          description: Indicates whether the caller is allowed to
                            send the actual request (not the preflight) using credentials.
                          nullable: true
                          type: boolean
                        allowHeaders:

        slightly more likely to do so now.
    *   Code that tries directly getting gradients with respect to symbolic
        Keras inputs/outputs. Use `GradientTape` on the actual Tensors passed to
        the already-constructed model instead.
    *   Code that requires very tricky shape manipulation via converted op
        layers in order to work, where the Keras symbolic shape inference proves