public static float GetRadius(this JewelRadius @this, float zoomLevel) => @this.GetRadius() * zoomLevel;
 public static IEnumerable <PassiveNodeDefinition> GetNodesInRadius(this PassiveTreeDefinition @this,
                                                                    ushort nodeId, JewelRadius radius)
 => @this.GetNodesInRadius(nodeId, radius.GetRadius());