add GetIPLDNode() method to NavigableNode

navipld.go

@@ -134,7 +134,7 @@ func (nn *NavigableIPLDNode) ChildTotal() uint {
 // function.
 // TODO: Check for errors to avoid a panic?
 func ExtractIPLDNode(node NavigableNode) Node {
-	return node.(*NavigableIPLDNode).GetIPLDNode()
+	return node.GetIPLDNode()
 }
 
 // TODO: `Cleanup` is not supported at the moment in the `Walker`.

walker.go

@@ -116,6 +116,9 @@ type NavigableNode interface {
 	// ChildTotal returns the number of children of the `ActiveNode`.
 	ChildTotal() uint
 
+	// GetIPLDNode returns actual IPLD Node
+	GetIPLDNode() Node
+
 	// TODO: Evaluate providing the `Cleanup` and `Reset` methods.
 
 	// Cleanup is an optional method that is called by the `Walker` when