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Does your friend have an iPhone? The default iOS keyboard has automatically converted double dashes into an emdash for at least seven years now.
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I think Google docs does this too, which drives me up the wall when I'm trying to write `command --foo=bar` and it turns it into an M-dash which obviously doesn't work.
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Em dashes are used often by LLMs, because humans use them often. On mac keyboards its easily typed. I know this is oversimplifying the situation, but I don't see the usefulness of the constant witch-hunting for allegedly LLM-generated text. For text we are long beyond the point, where we can differenciate between human generated and machine generated. We're even at the point, where it gets somewhat hard to identify machine generated audio and visuals.
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I might not be able to spot ALL AI generated text, but I can definitely spot some. It's still kind of quirky.
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Yeah, I agree with you. I'm so tired of people complaining about AI-generated text without focusing on the content. Just don't read it if you don't like it. It's another level of when people complain how a website is not readable for them or some CSS rendering is wrong or whatever. How does it add to the discussion?
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On a Mac, it's alt-dash in case you weren't being facetious
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Extra pedantic: that’s the en dash, the em dash is option-shift-hyphen
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Technically option-shift-dash. option-dash is an en-dash.
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On Windows it is Alt+0151. Harder to use than on Mac but definitely possible, I frequently use it.

On recent versions Shift+Win+- also work, and Win+- produces en dash.

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I just type -- and jira fixes it.
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I really despise that people like you ruined em dashes for the rest of us who have enjoyed using them.
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I use Compose - - - on Linux and my cellphone (Unexpected Keyboard). Mac is Alt-_.
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