Fix InDesign bug with _.sortBy.

Former-commit-id: 3ed2c5fcb02885a9b3563cf9081f6e2af8826c6d

lodash.js

@@ -256,7 +256,11 @@
         return -1;
       }
     }
-    return ai < bi ? -1 : 1;
+    // The JS engine embedded in Adobe applications like InDesign has a buggy
+    // `Array#sort` implementation that causes it, under certain circumstances,
+    // to return the same value for `a` and `b`.
+    // See https://github.com/jashkenas/underscore/pull/1247
+    return ai < bi ? -1 : (ai > bi ? 1 : 0);
   }
 
   /**

test/test.js

@@ -3151,6 +3151,20 @@
   QUnit.module('lodash.sortBy');
 
   (function() {
+    test('should sort in ascending order', function() {
+      var actual = _.pluck(_.sortBy([
+        { 'num': 991 },
+        { 'num': 212 },
+        { 'num': 11 },
+        { 'num': 16 },
+        { 'num': 74 },
+        { 'num': 0 },
+        { 'num': 1515 }
+      ], 'num'), 'num');
+
+      deepEqual(actual, [0, 11, 16, 74, 212, 991, 1515]);
+    });
+
     test('should perform a stable sort (test in IE > 8, Opera, and V8)', function() {
       function Pair(x, y) {
         this.x = x;