fix an issue where empty lists & maps would point to the same shared mutable data

Author: Kiruse

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@terran-one/cw-simulate",
-  "version": "2.8.0-rc.2",
+  "version": "2.8.0-rc.3",
   "description": "Mock blockchain environment for simulating CosmWasm interactions",
   "main": "dist/index.js",
   "typings": "dist/index.d.ts",

src/index.ts

@@ -1,3 +1,6 @@
 export * from './CWSimulateApp';
 export * from './types';
 export * from './store';
+
+import { save, load } from './persist';
+export const persist = { save, load };

src/persist.ts

@@ -17,6 +17,7 @@ export const serde = SerdeProtocol.standard()
       };
     },
     ({ data, mutable }, deref) => {
+      if (!data.length) return List();
       const list = List().asMutable();
       Reference.all(deref, data, values => {
         for (const value of values) {
@@ -38,6 +39,7 @@ export const serde = SerdeProtocol.standard()
     ({ data, mutable }, deref) => {
       const map = Map().asMutable();
       const keys = Object.keys(data);
+      if (!keys.length) return Map();
       Reference.all(deref, keys.map(k => data[k]), values => {
         values.forEach((value, i) => {
           const key = keys[i];