Compaction of new database

[Brad King]

Maybe I don't understand compaction, but based on what I've read this
is meant to get rid of old doc versions, and essentially any
fragmentation that has occurred. What I'm seeing is for a brand new
database, I create approximately 300K documents and the size is 2.2GB.
I then run a compact from Futon, and size drops to 414MB. Since this
is a new database, which should only have one version of each
document, why the dramatic size change?