Fixing issues with strict mode

closes #45

lib/utils.js

@@ -145,15 +145,15 @@ function forEach(obj, fn) {
   }
 
   // Check if obj is array-like
-  var isArray = obj.constructor === Array || typeof obj.callee === 'function';
+  var isArrayLike = isArray(obj) || (typeof obj === 'object' && !isNaN(obj.length));
 
   // Force an array if not already something iterable
-  if (typeof obj !== 'object' && !isArray) {
+  if (typeof obj !== 'object' && !isArrayLike) {
     obj = [obj];
   }
 
   // Iterate over array values
-  if (isArray) {
+  if (isArrayLike) {
     for (var i=0, l=obj.length; i<l; i++) {
       fn.call(null, obj[i], i, obj);
     }

test/unit/utils/forEach.js

@@ -12,6 +12,19 @@ module.exports = {
     test.done();
   },
 
+  testArguments: function (test) {
+    var sum = 0;
+
+    (function () {
+      forEach(arguments, function (val) {
+        sum += val;
+      });
+    })(1, 2, 3, 4, 5);
+
+    test.equal(sum, 15);
+    test.done();
+  },
+
   testObject: function (test) {
     var keys = '';
     var vals = 0;