Currently ra_svn is the only ra layer that does not compare checksums for commits/updates/checkouts. The others were taken care of as part of issue #689, which was filed before ra_svn existed. Assigning to Greg Hudson initially. Greg, I'm happy to help with this, or more, depending on your load. Let me know. Filing this as a defect; integrity checking in a revision control system seems like more than an "enhancement", somehow :-).