First of all I've noticed that MP3 file returns many more info_pairs that the code is prepare to handle (i.e. tagversion, size, frames, frame_length, padding, time)
I quess MP3 evolved since 2001 when this package was first build.
1. I never worked with MP3 files before so my question to start would be: Do I need to accomodate (add fields in mp3_mp3s table) these new info pairs.
For now I ignored them by expanding "switch -exact $info_key" with those parameters and ignore them when found.