contract_status() ::
  delisting()
  | listing()
  | pending_listing()
  | suspension()
  | suspending_of_listing()
  | in_settlement()
  | delivering()
  | settlement_completed()
  | delivered()
  | suspended_listing()

delisting() :: 0

delivered() :: 8

delivering() :: 6

in_settlement() :: 5

listing() :: 1

pending_listing() :: 2

settlement_completed() :: 7

suspended_listing() :: 9

suspending_of_listing() :: 4

suspension() :: 3

t() :: %ExHuobi.Futures.Contract{
  contract_code: String.t(),
  contract_size: non_neg_integer(),
  contract_status: contract_status(),
  contract_type: String.t(),
  create_date: String.t(),
  delivery_date: String.t(),
  price_tick: number(),
  symbol: String.t()
}