docs: function clientOutputBufferLimit(val) {
    if(Array.isArray(val)) {
      val.forEach(function(limit) {
        var type = limit[0]
          , seconds = limit[3];
        if(!~Constants.CLIENT_CLASS.indexOf(type)) {
          throw new Error('Unrecognized client limit class');
        }
        if(seconds < 0) {
          throw new Error(
            'Negative number of seconds in soft limit is invalid');
        }
      })
    }
  }