If I'm interpreting the list right, I think they agree with you about flatten. I think the strikeout is supposed to indicate that the struck portion would have

If I'm interpreting the list right, I think they agree with you about flatten. I think the strikeout is supposed to indicate that the struck portion would have made the list, but they took corrective action. I spelunked through the commit history and the struck portion was indeed unstruck originally, and then when the situation was resolved they crossed it out and added the description afterwards.