in git, what ways are there to "lose" a commit in a way that you CAN'T recover using the reflog (so that you need to iterate over every single commit in the repository if you want to find it?

The only ways I know (using git's normal tools) are:

* using `git stash drop` or `git stash pop` to drop a stashed commit
* waiting 90+ days to try to recover the commit (so that it expires from the reflog)
* explicitly deleting the reflog in some way (rm -rf .git, git reflog expire, etc)

@b0rk the git stash case is actually recoverable with gitk until an auto gc happens with gitk --all $(git fsck --no-reflogs | awk '/dangling commit/ {print $3}')
@b0rk yes, this is still technically iterating over every commit, but you get a visual representation that makes it so much faster