diff --git a/lib/Twig/Loader/Array.php b/lib/Twig/Loader/Array.php
index 430efd060..136376a3a 100644
--- a/lib/Twig/Loader/Array.php
+++ b/lib/Twig/Loader/Array.php
@@ -80,7 +80,7 @@ class Twig_Loader_Array implements Twig_LoaderInterface, Twig_ExistsLoaderInterf
             throw new Twig_Error_Loader(sprintf('Template "%s" is not defined.', $name));
         }
 
-        return $this->templates[$name];
+        return $name.':'.$this->templates[$name];
     }
 
     public function isFresh($name, $time)
diff --git a/lib/Twig/Profiler/Dumper/Blackfire.php b/lib/Twig/Profiler/Dumper/Blackfire.php
index 6be67edf9..b253f3c09 100644
--- a/lib/Twig/Profiler/Dumper/Blackfire.php
+++ b/lib/Twig/Profiler/Dumper/Blackfire.php
@@ -22,7 +22,7 @@ class Twig_Profiler_Dumper_Blackfire
         $this->dumpProfile('main()', $profile, $data);
         $this->dumpChildren('main()', $profile, $data);
 
-        $start = microtime(true);
+        $start = sprintf('%f', microtime(true));
         $str = <<<EOF
 file-format: BlackfireProbe
 cost-dimensions: wt mu pmu
diff --git a/test/Twig/Tests/Fixtures/autoescape/name.test b/test/Twig/Tests/Fixtures/autoescape/name.test
index 801c477ed..04299bed3 100644
--- a/test/Twig/Tests/Fixtures/autoescape/name.test
+++ b/test/Twig/Tests/Fixtures/autoescape/name.test
@@ -2,8 +2,11 @@
 "name" autoescape strategy
 --TEMPLATE--
 {{ br -}}
+{{ include('index.js.twig') -}}
 {{ include('index.html.twig') -}}
 {{ include('index.txt.twig') -}}
+--TEMPLATE(index.js.twig)--
+{{ br -}}
 --TEMPLATE(index.html.twig)--
 {{ br -}}
 --TEMPLATE(index.txt.twig)--
@@ -14,5 +17,6 @@ return array('br' => '<br />')
 return array('autoescape' => 'name')
 --EXPECT--
 &lt;br /&gt;
+\x3Cbr\x20\x2F\x3E
 &lt;br /&gt;
 <br />
diff --git a/test/Twig/Tests/Loader/ArrayTest.php b/test/Twig/Tests/Loader/ArrayTest.php
index ac3c73ed5..7e1ea8129 100644
--- a/test/Twig/Tests/Loader/ArrayTest.php
+++ b/test/Twig/Tests/Loader/ArrayTest.php
@@ -46,7 +46,29 @@ class Twig_Tests_Loader_ArrayTest extends PHPUnit_Framework_TestCase
     {
         $loader = new Twig_Loader_Array(array('foo' => 'bar'));
 
-        $this->assertEquals('bar', $loader->getCacheKey('foo'));
+        $this->assertEquals('foo:bar', $loader->getCacheKey('foo'));
+    }
+
+    public function testGetCacheKeyWhenTemplateHasDuplicateContent()
+    {
+        $loader = new Twig_Loader_Array(array(
+            'foo' => 'bar',
+            'baz' => 'bar',
+        ));
+
+        $this->assertEquals('foo:bar', $loader->getCacheKey('foo'));
+        $this->assertEquals('baz:bar', $loader->getCacheKey('baz'));
+    }
+
+    public function testGetCacheKeyIsProtectedFromEdgeCollisions()
+    {
+        $loader = new Twig_Loader_Array(array(
+            'foo__' => 'bar',
+            'foo' => '__bar',
+        ));
+
+        $this->assertEquals('foo__:bar', $loader->getCacheKey('foo__'));
+        $this->assertEquals('foo:__bar', $loader->getCacheKey('foo'));
     }
 
     /**
@@ -91,7 +113,7 @@ class Twig_Tests_Loader_ArrayTest extends PHPUnit_Framework_TestCase
         $loader->getCacheKey($name);
         $loader->getSourceContext($name);
         $loader->isFresh($name, time());
-        $loader->setTemplate($name, 'foobar');
+        $loader->setTemplate($name, 'foo:bar');
 
         // add a dummy assertion here to satisfy PHPUnit, the only thing we want to test is that the code above
         // can be executed without crashing PHP
diff --git a/test/Twig/Tests/Loader/ChainTest.php b/test/Twig/Tests/Loader/ChainTest.php
index 17ec482a2..733de4f02 100644
--- a/test/Twig/Tests/Loader/ChainTest.php
+++ b/test/Twig/Tests/Loader/ChainTest.php
@@ -74,8 +74,8 @@ class Twig_Tests_Loader_ChainTest extends PHPUnit_Framework_TestCase
             new Twig_Loader_Array(array('foo' => 'foobar', 'bar' => 'foo')),
         ));
 
-        $this->assertEquals('bar', $loader->getCacheKey('foo'));
-        $this->assertEquals('foo', $loader->getCacheKey('bar'));
+        $this->assertEquals('foo:bar', $loader->getCacheKey('foo'));
+        $this->assertEquals('bar:foo', $loader->getCacheKey('bar'));
     }
 
     /**