To your point about the diaeresis: The New Yorker does it in every instance where two same vowels are disconnected in pronunciation. Quite consistently, as far

To your point about the diaeresis: The New Yorker does it in every instance where two same vowels are disconnected in pronunciation. Quite consistently, as far as I know. Raymond Chen [1] does, too. [1] See how he writes "coöperation" e.g. here: https://blogs.msdn.microsoft.com/oldnewthing/20130607-00/?p=4143 https://blogs.msdn.microsoft.com/oldnewthing/20130607-00/?p=... -- I always wondered whether that meant that he read the New Yorker.