t() :: %Cloudevents.Format.V_0_2.Event{
  contenttype: String.t() | nil,
  data: any() | nil,
  extensions: %{optional(String.t()) => any()} | nil,
  id: String.t(),
  schemaurl: String.t() | nil,
  source: String.t(),
  specversion: String.t(),
  time: String.t() | nil,
  type: String.t()
}