It seems sometimes if I upload a song, the track attributes returned do not have valence or acousticness values. (They are NaN) I think it happens when a song is uploaded twice. For testing purposes, I have uploaded a song multiple times, and I don't think it should return NaN for these values ever. What's up? I'm accessing via jEN, and jEN doesn't have strict accessors to get audio_summary.acousticness and audio_summary.valence for the song. I had to use a separate method, getDouble("audio_summary.acousticness"). This seemed to work fine, but if a song is uploaded multiple times every other value (tempo, energy, etc.) would return correct values, but the valence/acousticness would not.
Would be very nice for this to be fixed ASAP if it is indeed a bug...