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Dupe—https://news.ycombinator.com/item?id=43447819 ("How to use an en-dash and em-dash correctly?", 43 comments)

More interestingly it is the same highly niche subject from two different websites in two days. HN is...different

This isn't niche, it is the sort of thing every child used to have drilled into them in primary school.

Yeah exactly, used to. It's niche now, and has been for decades.

It isn't niche just because education has taken a nosedive.