NodeBuilder: Use `.nodes` as `Set` instead of Array (#33664)

src/nodes/core/NodeBuilder.js

@@ -135,9 +135,9 @@ class NodeBuilder {
 		 * A list of all nodes the builder is processing
 		 * for this 3D object.
 		 *
-		 * @type {Array<Node>}
+		 * @type {Set<Node>}
 		 */
-		this.nodes = [];
+		this.nodes = new Set();
 
 		/**
 		 * A list of all nodes the builder is processing in sequential order.
@@ -531,7 +531,7 @@ class NodeBuilder {
 	 */
 	includes( node ) {
 
-		return this.nodes.includes( node );
+		return this.nodes.has( node );
 
 	}
 
@@ -816,9 +816,9 @@ class NodeBuilder {
 	 */
 	addNode( node ) {
 
-		if ( this.nodes.includes( node ) === false ) {
+		if ( this.nodes.has( node ) === false ) {
 
-			this.nodes.push( node );
+			this.nodes.add( node );
 
 			this.setHashNode( node, node.getHash( this ) );