make limit act like sql limit

src/queries/core/tool.js

@@ -233,9 +233,13 @@ function limit(limit_option, list, clone) {
   if (clone) {
     list = deepClone(list);
   }
-  list.splice(0, limit_option[0]);
-  if (limit_option[1]) {
-    list.splice(limit_option[1]);
+  if (limit_option.length > 1) {
+    list.splice(0, limit_option[0]);
+    if (limit_option[1]) {
+      list.length = limit_option[1];
+    }
+  } else if (limit_option.length === 1) {
+    list.length = limit_option[0];
   }
   return list;
 }

test/jio.storage/localstorage.tests.js

@@ -565,7 +565,7 @@
         "include_docs": true,
         "sort_on": [['title', 'ascending'], ['date', 'descending']],
         "select_list": ['title', 'date'],
-        "limit": [1] // ==> equal [1, 3] in this case
+        "limit": [1, 3]
       });
 
     }).always(function (answer) {

test/queries/key-localstorage.tests.js

@@ -116,7 +116,7 @@
         "include_docs": true,
         "sort_on": [['title', 'ascending'], ['date', 'descending']],
         "select_list": ['title', 'date'],
-        "limit": [1] // ==> equal [1, 3] in this case
+        "limit": [1, 3]
       });
 
     }).always(function (answer) {