Node-Red OPC-UA Server only working for Double?

Question

I am trying to create an OPC-UA server in Node-Red using node-red-contrib-opcua-server version 1.1.1. This works quite well for values declared as double.

The flow for this looks quite simple

The configuration of the Node Compact server for a double value looks like this (and thus pretty much follows the example)

const WC01_raw_mat = namespace.addVariable({
 "organizedBy": wc01,
 "browseName": "raw_mat",
 "nodeId": "ns=1;s=wc01_raw_mat",
 "dataType": "Double",
 "value": {
   "get": function () {
     return new Variant({
       "dataType": DataType.Double,
       "value": flexServerInternals.sandboxFlowContext.get("WC01_raw_mat")
     });
   },
   "set": function (variant) {
     flexServerInternals.sandboxFlowContext.set(
       "WC01_raw_mat",
       parseFloat(variant.value)
     );
     return opcua.StatusCodes.Good;
   }
 }});

If I check the value with an OPC-UA Client I can see my double with a value 0.0

However, my attempt to transfer an integer or string in addition to a double value fails. The adjustments for integers look like this:

const WC01_raw_mat = namespace.addVariable({
 "organizedBy": wc01,
 "browseName": "raw_mat",
 "nodeId": "ns=1;s=wc01_raw_mat",
 "dataType": "Integer",
 "value": {
   "get": function () {
     return new Variant({
       "dataType": DataType.Integer,
       "value": flexServerInternals.sandboxFlowContext.get("WC01_raw_mat")
     });
   },
   "set": function (variant) {
     flexServerInternals.sandboxFlowContext.set(
       "WC01_raw_mat",
       parseInt(variant.value)
     );
     return opcua.StatusCodes.Good;
   }
 }});

(Modifications I made: "dataType": "Integer","dataType": DataType.Integer,parseInt(variant.value) ) Unfortunately, no more data is displayed.

So, what did I made wrong or what did I miss? I am grateful for any tips.