@type t() :: %Riichi.Decomposer.ThirteenOrphans{
  blocks: [Riichi.Tile.t()] | nil,
  pair: (Riichi.Decomposer.pair() | nil) | nil,
  waiting_kind: (:single | :all_orphans) | nil,
  waiting_tiles: [Riichi.Tile.t()] | nil
}