mongodb returns incorrect type of a key

Im using node.js+express+mongodb+mongoose, trying to retrieve user from database by custom ids, page returns back completely empty due to incorrect datatype of id value, here is some part of my code:

var User = new Schema({
  name: String , 
  email: String ,
  id: Number,
  role: String
});
var userModel = mongoose.model('User', User);
var person = new userModel();

function loaduser(req, res, next) {
  userModel.find({}, req.params.id, function(err, user){
    if (user){
      req.user = user;
      console.log(user);
      next();
    }
  })
  console.log(typeof req.params.id);
};

//personal page route
app.get('/user/:id', loaduser, function(req, res){
  res.render('show', { users: req.user });
});

and then this returns in console:

string
{ _id: 5012aa222c2d4d5876c5acd0,
    email: 'alex@mail.com',
    id: '0',
    name: 'alex',
    role: 'admin' },

even though i declared type of id as Number it gets back as String. Any suggestions are welcome :)