code: function mset() {
    var args = slice.call(arguments)
      , req;
  
    // got a req object
    if(typeof args[args.length -1] === 'object') {
      req = args.pop();
    }
  
    for(var i = 0;i < args.length;i += 2) {
      this.setKey(args[i], args[i + 1], undefined, undefined, undefined, req);
    }
  
    return OK;
  }
docs: Set multiple keys to multiple values.