API for feature flipping

gistfile1.txt

I've been working on a feature flipping class, and I'm after some opinions on naming for the method that checks if the flip is active or not:

The example is for flipping the sign up feature of the application:

Which do you prefer and why?

    do something if sign_up_is_active?

or

    do something if sign_up_active?

What about:

do something if you_are_quite_certain_the_sigin_up_is_indeed_active