Care to sort an Object with Underscore anyone? I'm crazy

gistfile1.js

_.extend(request.params, {
    AWSAccessKeyId: this.key
  , SignatureVersion: 2
  , SignatureMethod: 'HmacSHA256'
  , Version: request.opts.version || '2009-04-15'
  , Timestamp: new Date().toISOString()
});
    
var sortedParams = _(request.params).chain()
    .map(function(v, k) { return [k,v]; })
    .sortBy(function(a) { return a[0]; })
    .reduce(function(s, v){ s[v[0]] = v[1]; return s; }, {})
    .value();