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FWIW sometimes I'll do an emdash -- which allows a conceptual aside -- by using two hyphens, but always with spacing so as not to confuse the usage with word-joining.

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When an em dash is used to indicate a pause, it's most often used without spacing between words and the em dash—except in newspapers [1].

[1] http://www.thepunctuationguide.com/em-dash.html

Yes, my usage would normally be with endash in traditional media AFAIAA. Punctuation, like grammar, serves the user in my mode of writing.

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