(not gp, and from memory awhile ago so please forgive lack of exact quotes & page numbers)
Bunch of places where the tone masked or downplayed real issues in ways that made other text suspect. As a concrete example, `head [] -> Exception` with something like "of course it errors if you take the first part of something that's not there" and `take 1 [] -> []` with "obviously taking one thing from an empty list gets you an empty list" -- uh, no. Maybe it's a historical wart, maybe there are good technical reasons, but different behavior in these cases is definitely not obvious!
Bunch of places where the tone masked or downplayed real issues in ways that made other text suspect. As a concrete example, `head [] -> Exception` with something like "of course it errors if you take the first part of something that's not there" and `take 1 [] -> []` with "obviously taking one thing from an empty list gets you an empty list" -- uh, no. Maybe it's a historical wart, maybe there are good technical reasons, but different behavior in these cases is definitely not obvious!