44c22a54c9
Spec traversals can now specify a topological ordering. A topologically- ordered traversal with input specs X1, X2... will * include all of X1, X2... and their children * be ordered such that a given node is guaranteed to appear before any of its children in the traversal Other notes: * Input specs can be children of other input specs (this is useful if a user specifies a set of specs to uninstall: some of those specs might be children of others) * `direction="parents"` will produce a reversed topological order (children always come before parents). * `cover="edges"` will generate a list of edges L such that (a) input edges will always appear before output edges and (b) if you create a list with the destination of each edge in L the result is topologically ordered |
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