In formal writing, like a resume, I tend to shy away from such nuance. I will only use a dash for a range, if needed. Otherwise, rather than dashes or such, pro

In formal writing, like a resume, I tend to shy away from such nuance. I will only use a dash for a range, if needed. Otherwise, rather than dashes or such, proper usage of commas, semicolons, and colons will usually suffice. Informal writing gets anything and everything. I'll mix it up all over the place, but I don't differentiate between the various dashes: You'll get a single dash and like it, dang it! :D