constructor (disableLosslessIntegers = false, useBigInt = false) {
    this._disableLosslessIntegers = disableLosslessIntegers
    this._useBigInt = useBigInt
  }
@constructor
@param {boolean} disableLosslessIntegers if this unpacker should convert all received integers to native JS numbers.
@param {boolean} useBigInt if this unpacker should convert all received integers to Bigint