@type t() :: %Relyra.LoginResult{
  connection: Relyra.Connection.t(),
  in_response_to: binary() | nil,
  issuer: binary() | nil,
  mapped_user: term() | nil,
  principal: Relyra.Principal.t(),
  relay_state: binary() | nil,
  return_to: binary() | nil,
  validation_trace: [map()]
}