The first Lazarus snapshots were based fpc snapshots (not releases). Later I decided to simply change from trunk or a fixes branch to a tagged version for building the fpc disk images.
For a while this turned out to be a good choice, especially when fpc 2.2.0 was released with a bug in the cfileutils unit (see
svn) and I could build a fixed fpc disk image.
Now, I think I should take the extra MB's for the docs for granted and use the stable version.