diff --git a/.gitignore b/.gitignore
index b92b9edba654c..cb92c19699e3f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,6 +41,7 @@ atlassian*
 !/pub/media/customer/.htaccess
 /pub/media/downloadable/*
 !/pub/media/downloadable/.htaccess
+/pub/media/favicon/*
 /pub/media/import/*
 !/pub/media/import/.htaccess
 /pub/media/theme/*
diff --git a/app/code/Magento/Contact/Model/Mail.php b/app/code/Magento/Contact/Model/Mail.php
index 809e5f3a54928..9a1f1ff8a2063 100644
--- a/app/code/Magento/Contact/Model/Mail.php
+++ b/app/code/Magento/Contact/Model/Mail.php
@@ -49,6 +49,9 @@ public function __construct(
      */
     public function send($replyTo, array $variables)
     {
+        /** @see \Magento\Contact\Controller\Index\Post::validatedParams() */
+        $replyToName = !empty($variables['data']['name']) ? $variables['data']['name'] : null;
+
         $this->inlineTranslation->suspend();
         try {
             $transport = $this->transportBuilder
@@ -62,7 +65,7 @@ public function send($replyTo, array $variables)
                 ->setTemplateVars($variables)
                 ->setFrom($this->contactsConfig->emailSender())
                 ->addTo($this->contactsConfig->emailRecipient())
-                ->setReplyTo($replyTo)
+                ->setReplyTo($replyTo, $replyToName)
                 ->getTransport();
 
             $transport->sendMessage();
diff --git a/app/code/Magento/Weee/view/frontend/layout/checkout_cart_index.xml b/app/code/Magento/Weee/view/frontend/layout/checkout_cart_index.xml
index bcb982f4fd82b..606aed676aca7 100644
--- a/app/code/Magento/Weee/view/frontend/layout/checkout_cart_index.xml
+++ b/app/code/Magento/Weee/view/frontend/layout/checkout_cart_index.xml
@@ -17,7 +17,7 @@
                                 <item name="weee" xsi:type="array">
                                     <item name="component" xsi:type="string">Magento_Weee/js/view/cart/totals/weee</item>
                                     <item name="config" xsi:type="array">
-                                        <item name="title" xsi:type="string">FPT</item>
+                                        <item name="title" xsi:type="string" translate="true">FPT</item>
                                     </item>
                                 </item>
                             </item>
diff --git a/lib/internal/Magento/Framework/App/Bootstrap.php b/lib/internal/Magento/Framework/App/Bootstrap.php
index dcac86d1700e3..f38f6c154a588 100644
--- a/lib/internal/Magento/Framework/App/Bootstrap.php
+++ b/lib/internal/Magento/Framework/App/Bootstrap.php
@@ -204,6 +204,7 @@ public function __construct(ObjectManagerFactory $factory, $rootDir, array $init
         $this->factory = $factory;
         $this->rootDir = $rootDir;
         $this->server = $initParams;
+        $this->objectManager = $this->factory->create($this->server);
     }
 
     /**
@@ -227,7 +228,6 @@ public function getParams()
     public function createApplication($type, $arguments = [])
     {
         try {
-            $this->initObjectManager();
             $application = $this->objectManager->create($type, $arguments);
             if (!($application instanceof AppInterface)) {
                 throw new \InvalidArgumentException("The provided class doesn't implement AppInterface: {$type}");
@@ -250,7 +250,6 @@ public function run(AppInterface $application)
             try {
                 \Magento\Framework\Profiler::start('magento');
                 $this->initErrorHandler();
-                $this->initObjectManager();
                 $this->assertMaintenance();
                 $this->assertInstalled();
                 $response = $application->launch();
@@ -279,7 +278,6 @@ protected function assertMaintenance()
         if (null === $isExpected) {
             return;
         }
-        $this->initObjectManager();
         /** @var \Magento\Framework\App\MaintenanceMode $maintenance */
         $this->maintenance = $this->objectManager->get(\Magento\Framework\App\MaintenanceMode::class);
 
@@ -312,7 +310,6 @@ protected function assertInstalled()
         if (null === $isExpected) {
             return;
         }
-        $this->initObjectManager();
         $isInstalled = $this->isInstalled();
         if (!$isInstalled && $isExpected) {
             $this->errorCode = self::ERR_IS_INSTALLED;
@@ -351,7 +348,6 @@ private function getIsExpected($key, $default)
      */
     private function isInstalled()
     {
-        $this->initObjectManager();
         /** @var \Magento\Framework\App\DeploymentConfig $deploymentConfig */
         $deploymentConfig = $this->objectManager->get(\Magento\Framework\App\DeploymentConfig::class);
         return $deploymentConfig->isAvailable();
@@ -364,7 +360,6 @@ private function isInstalled()
      */
     public function getObjectManager()
     {
-        $this->initObjectManager();
         return $this->objectManager;
     }
 
@@ -378,20 +373,7 @@ private function initErrorHandler()
         $handler = new ErrorHandler();
         set_error_handler([$handler, 'handler']);
     }
-
-    /**
-     * Initializes object manager
-     *
-     * @return void
-     */
-    private function initObjectManager()
-    {
-        if (!$this->objectManager) {
-            $this->objectManager = $this->factory->create($this->server);
-            $this->maintenance = $this->objectManager->get(\Magento\Framework\App\MaintenanceMode::class);
-        }
-    }
-
+    
     /**
      * Getter for error code
      *
diff --git a/lib/internal/Magento/Framework/App/ObjectManagerFactory.php b/lib/internal/Magento/Framework/App/ObjectManagerFactory.php
index 67d15d7882736..a08a309897342 100644
--- a/lib/internal/Magento/Framework/App/ObjectManagerFactory.php
+++ b/lib/internal/Magento/Framework/App/ObjectManagerFactory.php
@@ -32,7 +32,7 @@ class ObjectManagerFactory
      *
      * @var string
      */
-    protected $_locatorClassName = \Magento\Framework\ObjectManager\ObjectManager::class;
+    protected $_locatorClassName = \Magento\Framework\App\ObjectManager::class;
 
     /**
      * Config class name
@@ -169,7 +169,6 @@ public function create(array $arguments)
         $objectManager = new $this->_locatorClassName($this->factory, $diConfig, $sharedInstances);
 
         $this->factory->setObjectManager($objectManager);
-        ObjectManager::setInstance($objectManager);
 
         $generatorParams = $diConfig->getArguments(\Magento\Framework\Code\Generator::class);
         /** Arguments are stored in different format when DI config is compiled, thus require custom processing */
diff --git a/lib/internal/Magento/Framework/Config/View.php b/lib/internal/Magento/Framework/Config/View.php
index d0ad023f0cfd0..a90211cba0f95 100644
--- a/lib/internal/Magento/Framework/Config/View.php
+++ b/lib/internal/Magento/Framework/Config/View.php
@@ -152,7 +152,7 @@ protected function getIdAttributes()
     {
         $idAttributes = [
             '/view/vars' => 'module',
-            '/view/vars/var' => 'name',
+            '/view/vars/(var/)*var' => 'name',
             '/view/exclude/item' => ['type', 'item'],
         ];
         foreach ($this->xpath as $attribute) {
diff --git a/lib/internal/Magento/Framework/ObjectManager/Test/Unit/Config/_files/invalidConfigXmlArray.php b/lib/internal/Magento/Framework/ObjectManager/Test/Unit/Config/_files/invalidConfigXmlArray.php
index e691fde53dbe4..81b51056baee8 100644
--- a/lib/internal/Magento/Framework/ObjectManager/Test/Unit/Config/_files/invalidConfigXmlArray.php
+++ b/lib/internal/Magento/Framework/ObjectManager/Test/Unit/Config/_files/invalidConfigXmlArray.php
@@ -178,8 +178,8 @@
         </config>',
         [
             "Element 'virtualType', attribute 'name': [facet 'pattern'] The value '' is not accepted by the pattern '" .
-            "([a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)(\\\\[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*" .
-            ")*'." .
+            "(\\\\?[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)" .
+            "(\\\\[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)*'." .
             "\nLine: 2\n",
             "Element 'virtualType', attribute 'name': '' is not a valid value of the atomic type 'phpClassName'." .
             "\nLine: 2\n",
@@ -188,32 +188,14 @@
             "\nLine: 2\n",
         ],
     ],
-    'virtualtype with invalid_name' => [
-        '<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-            <virtualType name="\\BackslashPrefix\\IsNotAllowed" type="TypeName" shared="true"/>
-        </config>',
-        [
-            "Element 'virtualType', attribute 'name': [facet 'pattern'] The value '\\BackslashPrefix\\IsNotAllowed' " .
-            "is not accepted by the pattern '" .
-            "([a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)(\\\\[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*" .
-            ")*'." .
-            "\nLine: 2\n",
-            "Element 'virtualType', attribute 'name': '\\BackslashPrefix\\IsNotAllowed' " .
-            "is not a valid value of the atomic type 'phpClassName'." .
-            "\nLine: 2\n",
-            "Element 'virtualType', attribute 'name': Warning: No precomputed value available, the value was either " .
-            "invalid or something strange happend." .
-            "\nLine: 2\n",
-        ],
-    ],
     'virtualtype with empty_type' => [
         '<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
             <virtualType name="Name" type="" shared="true"/>
         </config>',
         [
             "Element 'virtualType', attribute 'type': [facet 'pattern'] The value '' is not accepted by the pattern '" .
-            "([a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)(\\\\[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*" .
-            ")*'." .
+            "(\\\\?[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)" .
+            "(\\\\[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)*'." .
             "\nLine: 2\n",
             "Element 'virtualType', attribute 'type': '' is not a valid value of the atomic type 'phpClassName'." .
             "\nLine: 2\n",
@@ -226,8 +208,8 @@
         [
             "Element 'virtualType', attribute 'name': [facet 'pattern'] The value '777Digits\\IsNotAllowed' " .
             "is not accepted by the pattern '" .
-            "([a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)(\\\\[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*" .
-            ")*'." .
+            "(\\\\?[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)" .
+            "(\\\\[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)*'." .
             "\nLine: 2\n",
             "Element 'virtualType', attribute 'name': '777Digits\\IsNotAllowed' " .
             "is not a valid value of the atomic type 'phpClassName'." .
@@ -237,4 +219,22 @@
             "\nLine: 2\n",
         ],
     ],
+    'virtualtype with digits_and_prefix_slash' => [
+        '<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+            <virtualType name="\\777Digits\\IsNotAllowed" type="TypeName" shared="true"/>
+        </config>',
+        [
+            "Element 'virtualType', attribute 'name': [facet 'pattern'] The value '\\777Digits\\IsNotAllowed' " .
+            "is not accepted by the pattern '" .
+            "(\\\\?[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)" .
+            "(\\\\[a-zA-Z_\x7f-\xc3\xbf][a-zA-Z0-9_\x7f-\xc3\xbf]*)*'." .
+            "\nLine: 2\n",
+            "Element 'virtualType', attribute 'name': '\\777Digits\\IsNotAllowed' " .
+            "is not a valid value of the atomic type 'phpClassName'." .
+            "\nLine: 2\n",
+            "Element 'virtualType', attribute 'name': Warning: No precomputed value available, the value was either " .
+            "invalid or something strange happend." .
+            "\nLine: 2\n",
+        ],
+    ],
 ];
diff --git a/lib/internal/Magento/Framework/ObjectManager/Test/Unit/Config/_files/valid_config.xml b/lib/internal/Magento/Framework/ObjectManager/Test/Unit/Config/_files/valid_config.xml
index 4fc7c30326def..a30715122dae8 100644
--- a/lib/internal/Magento/Framework/ObjectManager/Test/Unit/Config/_files/valid_config.xml
+++ b/lib/internal/Magento/Framework/ObjectManager/Test/Unit/Config/_files/valid_config.xml
@@ -64,4 +64,5 @@
             </argument>
         </arguments>
     </type>
+    <virtualType name="\BackslashPrefix\IsAllowed" type="TypeName" shared="true"/>
 </config>
diff --git a/lib/internal/Magento/Framework/ObjectManager/etc/config.xsd b/lib/internal/Magento/Framework/ObjectManager/etc/config.xsd
index 3cb346e4d9142..c4ab86fc7331d 100644
--- a/lib/internal/Magento/Framework/ObjectManager/etc/config.xsd
+++ b/lib/internal/Magento/Framework/ObjectManager/etc/config.xsd
@@ -36,7 +36,7 @@
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="([a-zA-Z_&#x7f;-&#xff;][a-zA-Z0-9_&#x7f;-&#xff;]*)(\\[a-zA-Z_&#x7f;-&#xff;][a-zA-Z0-9_&#x7f;-&#xff;]*)*"/>
+            <xs:pattern value="(\\?[a-zA-Z_&#x7f;-&#xff;][a-zA-Z0-9_&#x7f;-&#xff;]*)(\\[a-zA-Z_&#x7f;-&#xff;][a-zA-Z0-9_&#x7f;-&#xff;]*)*"/>
         </xs:restriction>
     </xs:simpleType>