Add boolean nodes

src/model/DataModel.ts

@@ -24,14 +24,18 @@ export class DataModel {
     this.listeners.forEach(listener => listener.invalidated(this))
   }
 
-  set(path: Path, value: any) {
+  get(path: Path) {
     let node = this.data;
-    for (let index of path.pop()) {
-      if (node[index] === undefined) {
-        node[index] = {}
-      }
+    for (let index of path) {
+      if (node === undefined) node = {}
       node = node[index]
     }
+    return node
+  }
+
+  set(path: Path, value: any) {
+    let node = this.get(path.pop())
+    if (node === undefined) node = {}
 
     console.log('Set', path.toString(), JSON.stringify(value))