Somewhat off-topic, but looking at the readme of JSONKit [1] I found: "At this time, there are no plans to support ARC in JSONKit. Although tenative [sic], it is extremely unlikely that ARC will ever be supported, for many of the same reasons that Mac OS X Garbage Collection is not supported."
Which seems kind of weird, seeing as ARC is going to be the default pretty soon.
Have you ever looked at the code in JSONKit? It makes perfect sense that it won't support ARC. JSONKit has a lot of small optimizations that deal with allocating memory that interfere with ARC and the assumptions the compiler needs to be able to make for ARC to work.
Which seems kind of weird, seeing as ARC is going to be the default pretty soon.
[1] https://github.com/johnezang/JSONKit