Index: js/widgets/Grid.js
===================================================================
--- js/widgets/Grid.js	(revision 81409)
+++ js/widgets/Grid.js	(working copy)
@@ -235,16 +235,24 @@
 			if (column.hasOwnProperty('sortFormatter')) {
 				sortFormatter = column.sortFormatter;
 			}
+			var stringCompare = function() {
+				if (typeof(Intl) === 'object' && typeof(Intl.Collator) === 'function') {
+					var intlCollator =  new Intl.Collator(kernel.locale, {numeric: true});
+					return function(a, b) {
+						return intlCollator.compare(a, b) < 0;
+					};
+				} 
+				return function(a, b) {
+					return a.toLowerCase() < b.toLowerCase();
+				};
+			}();
 			var compare = function(aValue, bValue) {
 				var a = sortFormatter(aValue);
 				var b = sortFormatter(bValue);
-				if (typeof(a.localeCompare) === 'function') {
-					return a.localeCompare(b, kernel.locale, {numeric: true}) < 0;
-				} else if (typeof(a.toLowerCase) === 'function') {
-					return a.toLowerCase() < b.toLowerCase();
-				} else {
-					return a < b;
+				if (typeof(a) === 'string' && typeof(b) === 'string') {
+					return stringCompare(a, b);
 				}
+				return a < b;
 			};
 			return function(data) {
 				var comparison;