Connections with different colors according to data?

Just to be clear - the connections are set via `connectionsDataSource`, with data originating from the server. It would be highly undesired to have the server return something like `{ from: 1, to: 2, stroke: { color: "black" } }`, as the data is also used elsewhere in the application, where such visual definitions have no meaning, but rather the `type` property does.