File this in the "stupid things that waste half an hour of debugging time" category. Switching to trying to verify the memory leak fixed, I suddenly discovered that something like half of the tests were now failing... so combed through all of the changes trying to figure out what I screwed up... turns out I'd disabled the entire back-end half of the test suite so that I could be sure the leak was occuring on the client instead of the server side.

I'd rather be writing :) .