code: function ScriptNum(num, base) {
    if (!(this instanceof ScriptNum))
      return new ScriptNum(num, base);
  
    I64.call(this, num, base);
  }
docs: Script Number
  @see https://github.com/chjj/n64
  @alias module:script.ScriptNum
  @constructor
  @param {(Number|String|Buffer|Object)?} num
  @param {(String|Number)?} base
  @property {Number} hi
  @property {Number} lo
  @property {Number} sign