control-? is weird. backspace is still used for formatting bold or accents in intermediate stages of man pages. Note that SI, SO, ESC are ultimately defined b

control-? is weird. backspace is still used for formatting bold or accents in intermediate stages of man pages. Note that SI, SO, ESC are ultimately defined by ISO 2022, which despite its common mindshare is about more than codepages. Properly supporting them was needed until "assume UTF-8" finally became common, which is very recent. Nethack is already mentioned in TFA ...