https://arstechnica.com/security/2017/02/watershed-sha1-collision-just-broke-the-webkit-repository-others-may-follow/
so if uploading two files with some sha1 checksum to svn, it'll break
s/some/same/
<mercutio> so if uploading two files with same sha1 checksum to svn, it'll break
thought sha1 collision was never supposed to happen
well it was a "test case" for webkit
it isn't meant to be likely, but it was generated to be the same