Dashes are added to large words automatically, but people on the other side do not see them...
While fiddling with a weather bot, I tried it with a stupidly long name, and what was shown to me was the same long-ass word I'd typed but with dashes added. People on the channel reported not seeing them, but it surely showed on my screen.
Below is a link to a screenshot including the command I was typing.
This was on 3.0 Beta Build from 02/11/2017