code: function lpush(key /*value-1, value-N, req*/) {
    var val = this.getKey(key, req)
      , args = slice.call(arguments, 1)
      , req;
    if(typeof args[args.length - 1] === 'object') {
      req = args.pop();
    }
    if(val === undefined) {
      val = new List();
      this.setKey(key, val, undefined, undefined, undefined, req);
    }
    return val.lpush(args);
  }
docs: Insert all the specified values at the head of the list stored at key.