Example of the kinds of TODO's I write. It's not really a todo, more of a "TODON'T" but it's also a reminder to do something else in the future say, for example, if we were to drop iPhone 4 support.

gistfile1.m

  // TODO: Using the main context as the parent of the background context works
  //       fantastically on the iPhone 5 but not so much on the 4 where it takes
  //       too much processing from on the main thread and makes it jerky and
  //       unresponsive. Same goes for merging changes the old-fashioned way.
  //
  //       As a compromise, we use old-fashioned merging but only deletions, as
  //       these would otherwise cause the main context to barf if/when trying
  //       to save an object that was deleted in the background. *phew*