lastID-Implementation

Hello I had a look today into the lastID implementation of pear::db (mostly, 'cause someone complained on the phplib-maillist about not implementing mysql_inserted_id in pear, but that's another issue) and i found it rather strange. First it didn't create the table automatically, 'cause it didn't detect an DB-error (no idea why, this worked in former times.) second, and more important. why does it create a new table for each sequence and make an entry for each and every inserted id? I find the way, phplib does it (one table for all sequences and just updating the number) much better and easier to maintain. or did i really miss something (performance or whatever) ? so long chregu