AFNetworking/AFNetworking — comment on commit a9123824312753d5aad10a892614c3d5cd7a70ee
File:  line 0
By mattt:

To be honest, I was hesitant to change that property to `assign`, mainly because of how much one has to take on faith about `NSURLConnection` flouting fundamental object ownership contracts. However, I do believe that this is ultimately the "right" way to do it, and becomes a matter of making sure this way works as it should.

Could you try out [my experimental thread-safe branch](https://github.com/AFNetworking/AFNetworking/tree/experimental-thread-safe), and tell me if that fixes your crash? I'm much more confident about the robustness of everything in this branch, especially with the logic around `NSURLConnection` (I had been mistaken in thinking, for instance, that sending `cancel` automatically sends the delegate `connection:didFailWithError:`, when it actually just stops all future messaging to the delegate).