Ubuntu Multimedia :: Rhythmbox: Editing Track Name Changes File Size Drastically?

I changed the case of one letter ('N' to 'n') in a track name using Rhythmbox and the result is a file which is 7727 bytes smaller than the original (I saved a copy of the original file before editing the track name). The file is in ogg/vorbis format (160 Kb/s). I changed the track name back and the file size didn't change. However, the contents of the file are still drastically different (vastly more changed than merely the letter in the track name).I'm worried that Rhythmbox is doing something dreadful like decoding the file, changing the track name, and then completely re-encoding the file from scratch (meaning it runs the decoded audio through the lossy encoder to regenerate the file). Does anyone know whether or not Rhythmbox is doing this when the user edits the meta data (like the track name, artist, etc.)?