given the title, check out this screenshot
http://dl.dropbox.com/u/21786/commits.png
and know that only the last commit hash finds the pertinent revision. any commit hash should find the pertinent revision.
(...this is part of a big ball of wax IMO like T201 and T1083 and I kind of forgot the big picture plan to fix all this... :/ )
this commit hash thing breaks workflows for @aurelijus and friends. (there's some conversation in IRC around this at the bottom-ish of this page -- https://secure.phabricator.com/chatlog/channel/%23phabricator/?offset=10000)