watchEvent method returns a non-standard response, if I pass populates in options

[serhiipalash]

If I do like this

firebase.watchEvent('once', '/books/1', null, {
     populates: [{ child: 'author', root: 'users' }],
})
.then(response => {
    console.log(response)
})

In response I get object based on populates param

{
    users: {
        44: { name: 'John Doe' },
    }
}

Normally, without populates param, response will be

{
    data: {...},
    ordered: {...},
    path: '/books/1',
    type: ...
}

I use 2.0.0 version.