Flex Profiling gotcha when using framework RSL

I recently started using the Flex framework RSLs to reduce the size of our SWF, then just yesterday I tried to run the profiler on it and got a "Profiling can only be done on debug versions" error. My SWF was built for debug so I couldn't understand why I was getting those errors. It took me a while but I finally found a blog post that pointed out the obvious: the RSLs are release builds. So to profile my app I had to turn off the RSLS (use Merge into Code option).