Which simplejson module to use for Google AppEngine?
Where did you see anything recommending the use of google.appengine.ext.key_range.simplejson? That is only available because the key_range package happens to import simplejson. Don't use it like that.
I'm trying to figure out which simplejson module to use. Having looked back through my project I can see in some places I am using a mixture of both:

django.utils.simplejson
google.appengine.ext.key_range.simplejson

Which should I be using and why?