title: Is -[NSOperationQueue currentQueue] reliable?
body: <p>I know that <a href="https://stackoverflow.com/q/13237417/9636">GCD's dispatch_get_current_queue has been deprecated</a>, and <a href="https://stackoverflow.com/a/13238670/9636">it is an anti-pattern to use it for callbacks</a> anyway, but is <code>-[NSOperationQueue currentQueue]</code> reliable to use, or does it suffer from the same problems that GCD's dispatch_get_current_queue has? (I just want it so I can assert that I'm on the proper queue when my operation executes.)</p>