spine/spine — pull request #536 by jamiter (2014-04-18 10:24:54+00:00)
Title: Code cleanup

Return statements like these are not required in CoffeeScript.

And `!!statement` is a short version of `if statement then true else false` (both are casting a statement to a boolean).

It feels a bit like this to me:
http://programmers.stackexchange.com/questions/12807/make-a-big-deal-out-of-true

Maybe this was deliberately done for readability but it seemed redundant to me.