Ask HN: "Should:" vs "My expectation is that" / "Expected behavior:"

Hi HN I just stumbled into an interesting Twitter discussion. When reporting bugs for an piece of code that you didn't code yourself, should you use * "Should:" * "My expectation is that" * "Expected behavior:" ? My argument is quite simple http://www.hastebin.com/jiquvigori.1c but are there factors if didn't ... well ... factor in?