title: Difference betwee destroy and delete_doc in couchrest
body: <p>I've been trying to delete docs in couchdb (using ruby couchrest) to recover disk space.  I realize that <a href="http://rubydoc.info/github/couchrest/couchrest/CouchRest/Database#delete_doc-instance_method" rel="nofollow">deleting</a> docs may not free up space.  I then used Document::<a href="http://rubydoc.info/github/couchrest/couchrest/CouchRest/Document%3adestroy" rel="nofollow">destroy</a> (it sounded like it would work).  After compacting views it seemed like it freed up much more than it should.</p>
  
  <p>Can you explain what destroy does?  Do you know why I recovered so much space?</p>