Address comments

Author: mmermerkaya

packages/database/src/core/snap/IndexMap.ts

@@ -70,12 +70,12 @@ export class IndexMap {
     const sortedMap = safeGet(this.indexes_, indexKey);
     if (!sortedMap) throw new Error('No index defined for ' + indexKey);
 
-    if (sortedMap === fallbackObject) {
+    if (sortedMap instanceof SortedMap) {
+      return sortedMap;
+    } else {
       // The index exists, but it falls back to just name comparison. Return null so that the calling code uses the
       // regular child map
       return null;
-    } else {
-      return sortedMap as SortedMap<NamedNode, Node>;
     }
   }
 

packages/database/src/core/snap/Node.ts

@@ -116,8 +116,8 @@ export interface Node {
   forEachChild(index: Index, action: (a: string, b: Node) => void): any;
 
   /**
-   * @param {boolean=} exportFormat True for export format (also wire protocol format).
-   * @return {*} Value of this node as JSON.
+   * @param exportFormat True for export format (also wire protocol format).
+   * @return Value of this node as JSON.
    */
   val(exportFormat?: boolean): any;
 

packages/polyfill/index.ts

@@ -24,10 +24,13 @@ import 'promise-polyfill/lib/polyfill';
 // ES Stable
 import 'core-js/features/array/find';
 import 'core-js/features/array/find-index';
+import 'core-js/features/array/from';
 import 'core-js/features/object/assign';
 import 'core-js/features/object/entries';
 import 'core-js/features/object/values';
 import 'core-js/features/string/starts-with';
 import 'core-js/features/string/repeat';
 import 'core-js/features/symbol';
 import 'core-js/features/symbol/iterator';
+import 'core-js/features/map';
+import 'core-js/features/set';