-spec
     full_meshes(classy:cluster_info()) -> #{classy:cluster_id()
                                                 => [partition()]}.

This greedy algorithm finds full meshes in the network. Each site appears in exactly one full mesh.

Note: because of that property, this function returns ambiguous results when network partitions are overlapping. More specifically, it will be overly eager in detecting partitions, and will ignore some existing links.

-spec bidi_link(classy:cluster_info(), node(),
                node()) -> {ok, boolean()} | {error, _}.

Return {ok, true} if nodes are mutually connected to each other, or {ok, false} when either node considers the other disconnected.

If either node is absent in the ClusterInfo, then an error tuple is returned.

-spec unid_link(classy:cluster_info(), node(),
                node()) -> {ok, boolean()} | {error, _}.

Return {ok, Value} if node A is alive and appears in ClusterInfo. Then the value indicates whether A is currently connected to B.

Error tuple is returned if A is unreachable.