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Three dots doesn't look like an ellipsis in a monospaced font, it's far too wide.

It can if you use a monospaced font with ligatures.

Take a look at Fira Code [1]. I use it in Vim and IntelliJ, and it looks great with Rust and other functional languages.

[1] https://github.com/tonsky/FiraCode

Well, I'm sure you know what I meant.

I'm pretty sure he did know what you meant, and offered a serious response. I think he's suggesting that perhaps the aesthetics of the ellipsis is what prevented it from being selected.

It's already a keyword or operator (not sure which) used in range notation (1..2); why add a new operator when an old one will do?

Three dots are for inclusive ranges, two for exclusive