Moved more polyfill code into the engine proper

assets/scripts/children_test.toy

@@ -0,0 +1,30 @@
+import node;
+
+//util to generate and init a child node of a given parent
+fn makeChild(parent: opaque, fname: string) {
+	var child: opaque = loadNode(fname);
+	parent.pushNode(child);
+	child.initNode();
+	return child;
+}
+
+fn onInit(node: opaque) {
+	for (var i = 0; i < 20; i++) {
+		node.makeChild("scripts:/tilemap/tile.toy");
+	}
+
+	node.freeChildNode(10);
+	var n = node.getChildNode(10);
+
+	for (var i = 0; i < 20; i++) {
+		//this would originally prune tombstones...
+		node.makeChild("scripts:/tilemap/tile.toy");
+	}
+
+	print node.getChildNodeCount();
+
+	var m = node.getChildNode(10);
+
+	print n;
+	print m;
+}