@type t() ::
  {RaftedValue.TermNumber.t(), RaftedValue.LogIndex.t(), :command,
   {GenServer.from(), RaftedValue.Data.command_arg(), reference()}}
  | {RaftedValue.TermNumber.t(), RaftedValue.LogIndex.t(), :query,
     {GenServer.from(), RaftedValue.Data.query_arg()}}
  | {RaftedValue.TermNumber.t(), RaftedValue.LogIndex.t(), :change_config,
     RaftedValue.Config.t()}
  | {RaftedValue.TermNumber.t(), RaftedValue.LogIndex.t(), :leader_elected,
     pid()}
  | {RaftedValue.TermNumber.t(), RaftedValue.LogIndex.t(), :add_follower, pid()}
  | {RaftedValue.TermNumber.t(), RaftedValue.LogIndex.t(), :remove_follower,
     pid()}
  | {RaftedValue.TermNumber.t(), RaftedValue.LogIndex.t(), :restore_from_files,
     pid()}
  | {RaftedValue.TermNumber.t(), RaftedValue.LogIndex.t(), :leader_elected2,
     [pid()]}