I have two IEnumerable<string>s that contain the same data. However, they are provided by two different functions so their type doesn't match, and I think that is confusing Assert.Equal. Here is a quick repro case:
(moved to http://pastebin.com/nBa5wYik
due to codeplex formatting fail)
Position: First difference is at position 15
It is entirely possible that this is as designed, since the two types don't match, but I would argue that if I'm testing two IEnumerables, I care more about their contents and not where they came from.