Some people were asking for a way to change table schemas easily, so I came up with a DSL for doing that, so you can do stuff like:
:name, :text, :unique => true
And Sequel will generate the correct SQL for you.
Sequel Interview with Sharon Rosner (emphasis mine)
For a second that looked a lot like another language I knew, and then I looked more closely. Silly me. Those leading colons make all the difference.