Cannot get defaults when retrieving only certain fields

omg.js

// Load Dependencies
var
  mongoose  = require('mongoose'),
  vows      = require('vows'),
  suite     = vows.describe('Mongoose ' + mongoose.version + ' test issue #876'),
  assert = require('assert'),
  EventEmitter = require('events').EventEmitter
;

// Initialize Connection
mongoose.connect('mongodb://localhost/mongoose_test_issue_876');

// Define Schema
var DemoSchema = new mongoose.Schema({
    name    : String
  , surname : String
  , active  : { type : Boolean, default : false }
});

// Set Model
mongoose.model('Demo', DemoSchema);

// Get Model
var Demo = mongoose.model('Demo');

// Create Tests
suite.addBatch({
  'Create database entry' : {
    topic : function () {
      var
        promise = new EventEmitter(),
        demo = new Demo({ name : 'Panagiotis', surname : 'Kosmidis'})
      ;
      demo.save(function (err) { promise.emit('success', err) });
      
      return promise;
    },

    'Data stored in database' : function (topic) {
      assert.equal(topic, null);
    }
  },
  
  'Retrieve data with all fields' : {
    topic : function () {
      var promise = new EventEmitter();
      Demo.findOne({ name : 'Panagiotis' }, function (err, doc) {
        promise.emit('success', doc.active);
      });
      return promise;
    },
    
    'Active should be false' : function (topic) {
      assert.equal(topic, false);
    }
  },

  'Retrieve data with specific fields' : {
    topic : function () {
      var promise = new EventEmitter();
      Demo.findOne({ name : 'Panagiotis' }, ['name', 'active'], function (err, doc) {
        promise.emit('success', doc.active);
      });
      return promise;
    },

    'Active should be false' : function (topic) {
      assert.equal(topic, false);
    }
  }
}).run();