docs: function getValueBuffer(key, req, stringify) {
    var val = this.getKey(key, req);
    // should have buffer, string or number
    if(val !== undefined) {
      if(typeof val === 'number' && !stringify) val = new Buffer([val]);
      val = (val instanceof Buffer) ? val : new Buffer('' + val);
    }
    return val;
  }