docs: function sequential() {
    var number = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
    var offset = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
  
    if (number instanceof Array) {
      return sequentialBuilder(number, offset);
    }
  
    return offset + number;
  }