[web2py] Does web2py Cache Auth Queries

[Ross Peoples]

I am finding myself using auth.has_membership() and auth.has_permission() 
quite often in a module. Are either of these cached? I looked through the 
Auth code a bit and didn't see anything, so I was wondering it if did it 
somewhere else. If not then I should probably write my own 
has_membership/has_permission function that returns a cached value or calls 
the Auth methods.