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    Not sure why you received a downvote, since it mentions something which is missing in other answers. The presence of the code contract is a pretty good guarantee, and also gives an excellent answer to the original question. +1 for the idea of looking at the actual implementation. Commented Mar 2, 2015 at 20:32
  • I love code contracts. Commented Mar 2, 2015 at 23:59
  • I'm quite sure that method is not available on iOS, so it's rather pointless. Commented Nov 28, 2022 at 9:34