denful/den#686 asks, underneath the priority table
it proposes, for a module's contents to be transitively mapped to override instead of
conflict -- a recursive property of the submodule and everything under it, with no per-component
lib.mkForce.
The useful version of that is not a declared override list. It is that precedence falls out of where a contribution sits in the graph, with an explicit relation available for the cases where position is wrong. Most of the machinery for this already exists in gen-view, which implements the resolution