Index of the inbound turn the replies belong to (-1 = before the first inbound turn).
OptionaltriggerText of that inbound turn.
Position of the reply within its step (and chat, when order is 'per-chat').
OptionalexpectedOptionalactualOptionalfieldFirst field that differs ('kind', 'text', 'content.buttons.0.text', 't', 'id').
One difference between the expected and the actual conversation.