code: function(obj, key, value) {
      if(typeof obj[key] === "undefined") {
          obj[key] = value;
      }
      else {
          //Check if the current option is not an array
          if(Array.isArray(obj[key]) === false) {
              obj[key] = [obj[key]];
          }
          obj[key].push(value);
      }
  }
docs: Save an option