Using query across different levels doesn't function

Hi

I have a document with the following structure:
        {
            "playlist":
            {
                "name": "newies",
                "tracks": [
                    { "file": "new1", "title": "very new song" },
                    { "file": "new2", "title": "even newer" }
                ]
            }
        }

This is my index expression:
expression: ["playlist.name", "playlist.tracks.file", "playlist.tracks.title"]

This is my query:
query: [{"name":"*"}, {"file":"*"}, {"title":"*"}]

However when I set the query to a listview only the first item for the track is displayed. Also if i have multiple documents with tracks when i set the name in the query to filter to only one playlist (document) this doesn't function as well. There is an example app here [0]

0 - https://code.launchpad.net/~andrew-hayzen/+junk/test-u1db-playlists