With Docker the idea is like well you want it. You want to isolate it so let's do this let me give you an entire separate copy of Linux. Whereas in Posey I just want Python configured not everything. Well and even more like in Docker if you want to make sure that you run Docker build twice and get the same package versions like you have to do that yourself. It's a whole thing with lots of ways to get it wrong, whereas in Posey the way I've written it currently is just like there is one operation one internal function that takes a set of like okay these are the packages I want and it like renders that down into a block file. And then that