Right now, we use either – or — to do
dashes. Just as ---- renders an <hr>, we should have --
render an en-dash and --- render an em-dash, as in TeX.
There's space in the parser for this markup.
If two dash variants would confuse people, having only
one would work as well, with just -- as valid dash
syntax. It'd end the timeless revert wars over
([]--[]) vs ([] – []);
the former is readable in wikitext, the latter looks
nicer when rendered.
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