composer/composer — comment on commit 2e211c4649b524bd64afb90406d89a66c9025cba
File: src/Composer/Downloader/SvnDownloader.php line 31
By Seldaek:

Nope, since SVN uses a mix of URLs and revisions to refer to an exact commit on one branch, the reference should contain the revision, for example: `/branches/1.x@3902`. Whenever someone works on a SvnDriver for the VcsRepository, I'll make sure that's in it.