type inference not working for .toOuter; Scala 3, scala-graph 1.13.2

[Simon Leischnig]

Hi, 

I was giving scala-graph a go with a Scala 3 project. I try to reproduce the example given in http://www.scala-graph.org/guides/core-inner-outer.html . However, in line 3, there is unexpected behavior, I think:

```

1. val g = Graph(1~2) // Graph[Int,UnDiEdge](1, 2, 1~2)
2. val n1 = g.nodes.head // g.NodeT = 1 or 2
3. n1.toOuter // Int = 1 or 2 <--- not so: the type of n1 is inferred to `N`; the following line fails type check.
4. val n1o: Int = n1.toOuter // fails

```

Any suggestions on how to proceed?

Thanks,

Simon L.

[Simon Leischnig]

PS: I am also posting this here: https://github.com/scala-graph/scala-graph/issues/217

[empen...@gmail.com]

see https://github.com/scala-graph/scala-graph/issues/217