Sorting: String sorting converts values to string

Fixes #93

src/jsgrid.sort-strategies.js

@@ -15,7 +15,7 @@
             if(!isDefined(str2))
                 return 1;
 
-            return str1.localeCompare(str2);
+            return ("" + str1).localeCompare("" + str2);
         },
 
         number: function(n1, n2) {

tests/jsgrid.sort-strategies.tests.js

@@ -1,43 +1,51 @@
-$(function() {
-
-    var sortStrategies = jsGrid.sortStrategies;
-
-
-    module("sortStrategies");
-
-    test("string sorting", function() {
-        var data = ["c", "a", "d", "b"];
-
-        data.sort(sortStrategies["string"]);
-
-        deepEqual(data, ["a", "b", "c", "d"]);
-    });
-
-    test("number sorting", function() {
-        var data = [5, 3.2, 1e2, 4];
-
-        data.sort(sortStrategies["number"]);
-
-        deepEqual(data, [3.2, 4, 5, 100]);
-    });
-
-    test("date sorting", function() {
-        var date1 = new Date(2010, 0, 1),
-            date2 = new Date(2011, 0, 1),
-            date3 = new Date(2012, 0, 1);
-
-        var data = [date2, date3, date1];
-
-        data.sort(sortStrategies["date"]);
-
-        deepEqual(data, [date1, date2, date3]);
-    });
-
-    test("numberAsString sorting", function() {
-        var data = [".1", "2.1", "4e5", "2"];
-
-        data.sort(sortStrategies["numberAsString"]);
-
-        deepEqual(data, [".1", "2", "2.1", "4e5"]);
-    });
-});
+$(function() {
+
+    var sortStrategies = jsGrid.sortStrategies;
+
+
+    module("sortStrategies");
+
+    test("string sorting", function() {
+        var data = ["c", "a", "d", "b"];
+
+        data.sort(sortStrategies["string"]);
+
+        deepEqual(data, ["a", "b", "c", "d"]);
+    });
+
+    test("string sorting should be robust", function() {
+        var data = ["a", 1, true, "b"];
+
+        data.sort(sortStrategies["string"]);
+
+        deepEqual(data, [1, "a", "b", true]);
+    });
+
+    test("number sorting", function() {
+        var data = [5, 3.2, 1e2, 4];
+
+        data.sort(sortStrategies["number"]);
+
+        deepEqual(data, [3.2, 4, 5, 100]);
+    });
+
+    test("date sorting", function() {
+        var date1 = new Date(2010, 0, 1),
+            date2 = new Date(2011, 0, 1),
+            date3 = new Date(2012, 0, 1);
+
+        var data = [date2, date3, date1];
+
+        data.sort(sortStrategies["date"]);
+
+        deepEqual(data, [date1, date2, date3]);
+    });
+
+    test("numberAsString sorting", function() {
+        var data = [".1", "2.1", "4e5", "2"];
+
+        data.sort(sortStrategies["numberAsString"]);
+
+        deepEqual(data, [".1", "2", "2.1", "4e5"]);
+    });
+});