diff --git a/lib/adapters/memory.js b/lib/adapters/memory.js
index 9d8e0ac2..dd05d76b 100644
--- a/lib/adapters/memory.js
+++ b/lib/adapters/memory.js
@@ -129,7 +129,7 @@ function applyFilter(filter) {
             return value.match(example);
         }
         // not strict equality
-        return example == value;
+        return (example !== null ? example.toString() : example) == (value !== null ? value.toString() : value);
     }
 }