Quick tip, instead of passing true here, having an options object improves readability. As somebody who's never seen it before, the following does the opposite of what I expect:

  pagex('/users', true, function(){ ... });

But _this_ is more readable—communicates exactly what I need to know, and requires no previous knowledge of the library:

  pagex('/users', { negate: true }, function(){ ... });

Thanks for sharing your library, I love how you've put the ergonomics of use first. :)