'or' query with different data types in sails.js

Given routes

GET /user/42
GET /user/dude

where 42 is user id and dude is username.

So, I want to have method in my controller that return user for both cases. Here it is:

// api/controllers/UserController.js
findOne: function(req, res) {
    User.findOne({
        or: [
            {id: req.params.id},
            {username: req.params.id}
        ]
    }).exec(function(err, user) {
        if (err) {
            return console.log(err);
        }
        res.json(user);
    });
},

When I try to GET /user/42 everything is fine.

When I try to GET /user/dude I get error:

Error (E_UNKNOWN) :: Encountered an unexpected error

error: invalid input syntax for integer: "dude"

It seems like sails refuses to process {id: 'dude'} because of type mismatch.

I am using sails 0.10.5 with sails-postgresql 0.10.9. So what am I doing wrong?

UPD: I do know how to solve problem. Of course I can put if statement to my controller and check what type of parameter it got. Actually, I just created two routes with regexp parameters that point to single method.

My actual problem is why I can not do this with or. Does sails provide such way?