is sed s/—/--/ the new meta
And as GP wrote, it would take a substantial amount of time to explain to a normie (infinite I'd say, but let's not despair).
(Also I just learned that ASCII 0x2d/unicode U+002D is more properly called a "hyphen" [well, "HYPHEN-MINUS"], not a "dash".)
this is maybe the fifth time i've seen this happen on hn in the last few weeks
My keyboard has -.