638. The arbitrator may, on a party’s request, take any provisional measure or any measure to safeguard the parties’ rights for the time and subject to the conditions the arbitrator determines and, if necessary, require that a suretyship be provided to cover costs and the reparation of any prejudice that may result from such a measure. Such a decision is binding on the parties but one of them may, if necessary, ask the court to homologate the decision to give it the same force and effect as a judgment of the court.