Execute javascript in Sel2Lib #96

So in selenium1,
I can do this:
${text} Execute Javascript window.$('.......').text()

But when I was playing with Sel2, I see that I HAVE to do this:
${text} Execute Javascript return window.$('.......').text()

I have to explicitly say return infront of my window.$... and then it worked.
I tried to do the same thing in Sel1 to see if this was backwards incompatible , it threw an error when I used return window.$...

Why is this so? If there is a possiblity to have return as optional in Sel2 it would be great