phobos commit, revision 1683 user: rsinfu msg: [1.x] Fixed bugzilla 978: std.utf's toUTF* functions accept some invalid and reject some valid UTF. * Fixed decode() to accept U+FFFE and U+FFFF. * Changed some assert contracts (which check input for validity) to if-throw. http://www.dsource.org/projects/phobos/changeset/1683