diff --git a/source/Ox.UI/js/Form/Ox.Filter.js b/source/Ox.UI/js/Form/Ox.Filter.js
index f786a9ca..8faa6715 100644
--- a/source/Ox.UI/js/Form/Ox.Filter.js
+++ b/source/Ox.UI/js/Form/Ox.Filter.js
@@ -66,7 +66,11 @@ Ox.Filter = function(options, self) {
             {id: '<', title: 'is less than'},
             {id: '>', title: 'is greater than'},
             {id: '-', title: 'is between'},
-            {id: '!-', title: 'is not between'}
+            {id: '!-', title: 'is not between'}/*,
+            {id: '^', title: 'starts with'},
+            {id: '!^', title: 'does not start with'},
+            {id: '$', title: 'ends with'},
+            {id: '!$', title: 'does not end with'}*/
         ],
         string: [
             {id: '=', title: 'is'},
@@ -356,9 +360,9 @@ Ox.Filter = function(options, self) {
                 : [self.options.query.conditions[pos].conditions[subpos]],
             isUseless = false;
         Ox.forEach(conditions, function(condition) {
-            isUseless = Ox.getObjectById(
-                    self.options.findKeys, condition.key
-                ).type == 'text'
+            isUseless = ['string', 'text'].indexOf(
+                    Ox.getObjectById(self.options.findKeys, condition.key).type
+                ) > -1
                 && condition.operator == (self.options.query.operator == '&' ? '' : '!')
                 && condition.value == ''
             return isUseless;
diff --git a/source/Ox.UI/js/Form/Ox.Select.js b/source/Ox.UI/js/Form/Ox.Select.js
index 5d0e7335..6fbf758f 100644
--- a/source/Ox.UI/js/Form/Ox.Select.js
+++ b/source/Ox.UI/js/Form/Ox.Select.js
@@ -196,7 +196,7 @@ Ox.Select = function(options, self) {
     that.selectItem = function(id) {
         //Ox.print('selectItem', id, Ox.getObjectById(self.options.items, id).title)
         self.options.type == 'text' && self.$title.html(
-            Ox.getObjectById(self.options.items, id).title[0] // fixme: title should not have become an array
+            Ox.getObjectById(self.options.items, id).title
         );
         self.$menu.checkItem(id);
         self.checked = self.optionGroup.checked();
diff --git a/source/Ox.js b/source/Ox.js
index aec3cb7e..9df7114b 100644
--- a/source/Ox.js
+++ b/source/Ox.js
@@ -434,12 +434,12 @@ Ox.clone <f> Returns a (shallow or deep) copy of an object or array
 @*/
 
 Ox.clone = function(col, deep) {
-    var ret;
+    // fixme: is there any use case for shallow copy?
+    var ret = Ox.isArray(col) ? [] : {};
     if (deep) {
-        ret = Ox.isArray(col) ? [] : {};
         Ox.forEach(col, function(val, key) {
             ret[key] = ['array', 'object'].indexOf(Ox.typeOf(val)) > -1
-                ? Ox.clone(val) : val;
+                ? Ox.clone(val, true) : val;
         });
     } else {
         ret = Ox.isArray(col) ? col.slice() : Ox.extend({}, col);
@@ -700,6 +700,7 @@ Ox.isEmpty <f> Returns true if a collection is empty
     true
 @*/
 Ox.isEmpty = function(val) {
+    // fixme: what about deep isEmpty?
     return Ox.len(val) == 0;
 };
 
@@ -4233,11 +4234,15 @@ Ox.serialize <f> Parses an object into query parameters
     'a=1&b=2&c=3'
     > Ox.serialize({a: 1, b: 2.3, c: [4, 5]})
     'a=1&b=2.3&c=4,5'
+    > Ox.serialize({string: 'foo', empty: {}, null: null, undefined: void 0})
+    'string=bar'
 @*/
 Ox.serialize = function(obj) {
     var arr = [];
     Ox.forEach(obj, function(val, key) {
-        arr.push(key + '=' + val);
+        if (!Ox.isEmpty(val) && !Ox.isNull(val) && !Ox.isUndefined(val)) {
+            arr.push(key + '=' + val);
+        }
     });
     return arr.join('&');
 };