[optimize] Optimise updating Node Proxies

Author: adamretter

exist-core/src/main/java/org/exist/dom/persistent/NodeProxy.java

@@ -236,8 +236,8 @@ public NodeProxy(final Expression expression, final DocumentImpl doc, final Node
     public void update(final ElementImpl element) {
         invalidateCachedNode();
         this.doc = element.getOwnerDocument();
-        this.nodeType = UNKNOWN_NODE_TYPE;
-        this.internalAddress = StoredNode.UNKNOWN_NODE_IMPL_ADDRESS;
+        this.nodeType = Node.ELEMENT_NODE;
+        this.internalAddress = element.getInternalAddress();
         this.nodeId = element.getNodeId();
         this.match = null;
         this.context = null;