Consider all object params as keys if none exists

lib/local-cache.js

@@ -100,6 +100,13 @@ function refresh(callback) {
             return counter = 0;
           }
 
+          // If no keys are defined, consider all parameters as keys to keep the
+          // same behavior from v1.0
+          for (let obj of objects) {
+            if (!obj["_keys"] || !obj["_keys"].length)
+              obj["_keys"] = Object.keys(obj).filter(k => !k.startsWith("_"));
+          }
+
           res.sort((a, b) => {
             if (a.weight === b.weight)
               return a._id > b._id;