ember-data miserable bug duplicate record

I am using ember-data#canary and it has a serious bug when finding record from the store.

File: router.js

this.resource('games', function() {
    this.route('game', { path: '/:game' });
});

File: games_route.js

App.GamesRoute = Ember.Route.extend({
    model: function() {

        // request: GET /api/games
        // response: { games: [
        //               { id: 1, slug: lym, name: lose your marbles }
        // ] }
        return this.store.find('game');
    }
});

File: game_route.js

App.GamesGameRoute = Ember.Route.extend({
    model: function(params) {
        // this query causes bogus data to show up.
        // request: GET /api/games/lym
        // response: { game: { id: 1, slug: lym, name: lose your marbles } }
        return this.store.find('game', params.game);

    },

    serialize: function(game) {
        return { game: game.get('slug') };
    }
});

File game_model.js

App.Game = DS.Model.extend({
    slug: DS.attr('string'),
    name: DS.attr('string'),
});

When I visit /games ember-inspector data tab shows 1 game loaded.

`id`    `slug`    `name`
 1       lym       lose your marbles

When I visit /games/lym ember-inspector data tab shows 2 game loaded.

`id`    `slug`         `name`
 1       lym            lose your marbles
 lym     undefined      undefined

the second data is clearly bogus. I don't know where it comes from and it is causing me trouble.