Ensure _.reduce works with string Objects in IE < 9.

Former-commit-id: 0ee3496e52f4c393900f37f03e451b8e4abba206

lodash.js

@@ -2152,7 +2152,7 @@
       'var noaccum = arguments.length < 3;\n' +
       'if (thisArg) callback = iteratorBind(callback, thisArg)',
     'beforeLoop': {
-      'array': 'if (noaccum) result = collection[++index]'
+      'array': 'if (noaccum) result = iteratee[++index]'
     },
     'inLoop': {
       'array':

test/test.js

@@ -1115,6 +1115,30 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash.reduce');
+
+  (function() {
+    _.each({
+      'literal': 'abc',
+      'object': Object('abc')
+    },
+    function(collection, key) {
+      test('should work with a string ' + key + ' for `collection` (test in IE < 9)', function() {
+        var args;
+
+        var actual = _.reduce(collection, function(accumulator, value) {
+          args || (args = slice.call(arguments));
+          return accumulator + value;
+        });
+
+        deepEqual(args, ['a', 'b', 1, collection]);
+        equal(actual, 'abc');
+      });
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.reduceRight');
 
   (function() {