in order to guarantee correct resolution of mappings and mmio every time, all calls go straight to the core and are not cached
this makes this domain slower in performance than the other ones. it can also be more difficult to use in some cases because you have to resolve mappings that you may not care about.
there is also the possibility of side-effects on reads, although i do not believe that this actually happens in any situations. still, use at your own risk.
goyuken