For issue #4340, we decided to block filenames containing \n in FSFS and filenames containing control characters in libsvn_repos. (I agree with that decision.)
However, those changes are now nominated for backport towards 1.7.10 in 1.7.x/STATUS, and I voted -0 on them, saying that "[the new] libsvn_repos restrictions [are] not suitable for introduction in a patch release" --- that is, that libsvn_repos-1.7.10 should not forbid creating fspaths that contain control characters, because libsvn_repos-1.7.9 doesn't. Stefan asked to start a thread about that -0 vote, so here it is :)
