Portion of diagram object

c.ShapeNode
allowFlip:false
allowIncomingLinks:true
allowOutgoingLinks:true
anchorPattern:c.AnchorPattern {points: Array(3), regIndex: -1, serverRegistered: false}
anchorPointVisuals:[indexOf: ƒ, remove: ƒ, contains: ƒ, any: ƒ, all: ƒ, …]
bounds:mdraw.Rect {x: 30.862499999999997, y: 18.427083333333332, width: 24, height: 24, transform: M…n.D…g.Matrix, …}
brush:undefined
enabledHandles:511
expandable:false
expanded:true
flipX:false
flipY:false
font:null
graphicsContainer:mdraw.Container {x: 0, y: 0, content: Array(2), invalidParent: null, zIndex: 0, …}
handlesSize:undefined
handlesStyle:1
hyperLink:""
id:0     <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<


var tempJson = diagram.toJson()

running the above code on the diagram object produces the following output (just showing the relevant section).
The id which was 0 in the diagram object is now null in the JSON string.

"items":[{"__type":"MindFusion.Diagramming.ShapeNode","instanceId":0,"zIndex":0,
"tag":null,"id":null,"text":"Start",

Tried 3.0.1 and 3.2. Both failed to save the id.

Is it possible to create my own object and save it in a node or somehow associate it with a node? If so are there limitations to the object I could use? That would be a work around for me if it can be done.

Looks like setTag, getTag might do what I want?

I am able to store and retrieve my object using get and set tag, so I am good for now. I don't need Id to work.

Thanks