Remove cache for wrapping selector

Summary:
- Wrapping selector does not need to cache because the selector being wrapped has caching options
- Related to facebookexperimental#1840

Reviewed By: drarmstr

Differential Revision: D36956571

fbshipit-source-id: 2709b8603f94158f6a7843e743d1311ff569685d

packages/recoil/recoil_values/Recoil_atom.js

@@ -55,6 +55,7 @@
  * @flow strict-local
  * @format
  */
+
 'use strict';
 
 import type {Loadable, LoadingLoadableType} from '../adt/Recoil_Loadable';
@@ -667,6 +668,12 @@ function atomWithFallback<T>(
       return baseValue instanceof DefaultValue ? options.default : baseValue;
     },
     set: ({set}, newValue) => set(base, newValue),
+    // This selector does not need to cache as it is a wrapper selector
+    // and the selector within the wrapper selector will have a cache
+    // option by default
+    cachePolicy_UNSTABLE: {
+      eviction: 'most-recent',
+    },
     dangerouslyAllowMutability: options.dangerouslyAllowMutability,
   });
   setConfigDeletionHandler(sel.key, getConfigDeletionHandler(options.key));