can subsets of the api have different prioroties?

[dominictarr]

I'm curious, to see how this interacts with depject/depject#27

if the output of combine is also a valid input (i.e. returns a module) how does the priority work? it might be a nice way to represent encapsulation. so say, depject is used to make scuttlebot and the UI, you'd do that way if sub assemblies are themselves reusable they can still be represented as depject modules combine(combine(flumedb...), sbot...) for example