Incomplete `Transition.to` passed to `routeWillChange` when using `{{#link-to}}` with a model

Given the following route definition:

**router.js**
```javascript
Router.map(function() {
this.route('foo', { path: 'foo/:id' });
});
```

The following application controller:

**application/controller.js**
```javascript
import Controller from '@ember/controller';
import { inject } from '@ember/service';

const SOME_MODEL = { id: 123 };

export default Controller.extend({
someModel: SOME_MODEL,
router: inject(),
init(...args) {
this._super(...args);

this.router.one('routeWillChange', ({ to }) => {
console.log(to.params);
});
}
});
```

And the following application template:

**application/template.hbs**
```handlebars
{{#link-to "foo" 123}}Click me{{/link-to}}
{{#link-to "foo" someModel}}Click me{{/link-to}}

{{outlet}}
```

Clicking the first link takes me to `http://localhost:4200/foo/123` and produces the following output in the console:

```
{id: "123"}
```

which is correct. Clicking the second link also takes me to `http://localhost:4200/foo/123`, however it produces the following output in the console:

```
{}
```

I was expecting these two `{{#link-to}}` to both produce the same console output.