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What is a `CoarsenedTarget`? Is it a target dependency graph where the dependencies and transitive dependencies are not flattened?
I see it is only used in the jdk-related backends - but I'm having troubles groking the docstrings:
```CoarsenedTarget:
    A set of Targets which cyclicly reach one another, and are thus indivisible.

CoarsenedTargets:
    The CoarsenedTarget roots of a transitive graph walk for some addresses.```
Ultimately I'm looking for a way to get dependencies of a packagable target, but if it has a dep (transitive or direct) on another target of the same type (another packagable target), do not traverse the other packagable target's dependencies as well.

It represents a dependency cycle, basically. The original target dep graph may have cycles, the dep graph induced on the coarsened targets will be a DAG

So we know, e.g., that we must compile all the files in the entire coarsened target in a single compiler run

oh. That makes sense. Turn the graph into a DAG. got it.

Then, that's not going to give me the tree of deps that I can include until some rule is met.