@type t() :: %Figler.Schema.StateMapping{
  last_top_level_change: Figler.Schema.TopLevelPlaybackChange.t() | nil,
  last_top_level_change_status: Figler.Schema.PlaybackChangeKeyframe.t() | nil,
  stable_path: Figler.Schema.GUIDPath.t() | nil,
  timestamp: float() | nil
}