fix(core): serialize state mutations, fix batch flushing/reentrancy, handle falsy initial values, dispose old StatePart on force, and improve notification/error handling

test/test.ts

@@ -40,8 +40,10 @@ tap.test('should dispatch a state action', async (tools) => {
   const done = tools.defer();
   const addFavourite = testStatePart.createAction<string>(async (statePart, payload) => {
     const currentState = statePart.getState();
-    currentState.currentFavorites.push(payload);
-    return currentState;
+    return {
+      ...currentState,
+      currentFavorites: [...currentState.currentFavorites, payload],
+    };
   });
   testStatePart
     .waitUntilPresent((state) => {