>>tkgall+(OP)
The em-dash giveaway is an actual Unicode em-dash character, right? I professionally had to learn Latex to write a paper in the 1990s and picked up a "---" habit ever since, and I've been wondering if that's some kind of weird LLM tell now.
>>tptace+X2
There's an easy keyboard shortcut for it on Macs. I always saw it as a signifier of "Mac user with enough interest in writing style to use em-dashes instead of parentheses."
But I'm not on a Mac right now so I don't know how to even make a real one at the moment other than that LaTeX method.
>>majorm+E3
Easy is almost an understatement; it's Alt+Hyphen. [Edit: My bad that's en-dash, can't tell the difference in this monospaced text field. Em-dash you have to hold shift.]
I guess on Windows it's Alt+0,1,5,1 on a numpad. Or you copy+paste from Character Map.
>>machin+f6
Or you've had WinCompose installed for years and type Compose+hyphen+hyphen+hyphen. — is easy to type that way. The same works for Linux with a compose key enabled, WinCompose is a program to give Windows a compose key, and comes with default sequences including those found by default in most distro's XCompose list.