@type t() :: [
  seasonal_length: pos_integer() | nil,
  trend_length: pos_integer() | nil,
  low_pass_length: pos_integer() | nil,
  seasonal_degree: 0 | 1 | nil,
  trend_degree: 0 | 1 | nil,
  low_pass_degree: 0 | 1 | nil,
  seasonal_jump: pos_integer() | nil,
  trend_jump: pos_integer() | nil,
  low_pass_jump: pos_integer() | nil,
  inner_loops: non_neg_integer() | nil,
  outer_loops: non_neg_integer() | nil,
  robust: boolean() | nil,
  iterations: pos_integer() | nil,
  lambda: float() | nil,
  seasonal_lengths: [pos_integer()] | nil
]