Format the javascript code in Tax module

app/code/Magento/Sales/Model/ResourceModel/EntityAbstract.php

@@ -121,10 +121,15 @@ protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
     {
         /** @var \Magento\Sales\Model\AbstractModel $object */
         if ($object instanceof EntityInterface && $object->getIncrementId() == null) {
+            $store = $object->getStore();
+            $storeId = $store->getId();
+            if ($storeId === null) {
+                $storeId = $store->getGroup()->getDefaultStoreId();
+            }
             $object->setIncrementId(
                 $this->sequenceManager->getSequence(
                     $object->getEntityType(),
-                    $object->getStore()->getGroup()->getDefaultStoreId()
+                    $storeId
                 )->getNextValue()
             );
         }

app/code/Magento/Store/Model/PathConfig.php

@@ -76,6 +76,8 @@ public function shouldBeSecure($path)
      */
     public function getDefaultPath()
     {
-        return $this->scopeConfig->getValue('web/default/front', ScopeInterface::SCOPE_STORE);
+        $store = $this->storeManager->getStore();
+        $value = $this->scopeConfig->getValue('web/default/front', ScopeInterface::SCOPE_STORE, $store);
+        return $value;
     }
 }

app/code/Magento/Tax/view/adminhtml/templates/class/page/edit.phtml

@@ -18,3 +18,10 @@ require(['jquery', "mage/mage"], function(jQuery){
 
 });
 </script>
+<script type="text/x-magento-init">
+    {
+        "#<?= /* @escapeNotVerified */ $block->getRenameFormId() ?>": {
+            "Magento_Tax/js/page/validate": {}
+        }
+    }
+</script>

app/code/Magento/Tax/view/adminhtml/web/js/page/validate.js

@@ -0,0 +1,15 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+define([
+    'jquery',
+    'mage/mage'
+], function (jQuery) {
+    'use strict';
+
+    return function (data, element) {
+        jQuery(element).mage('form').mage('validation');
+    };
+});

app/code/Magento/Webapi/Model/Rest/Swagger/Generator.php

@@ -39,7 +39,7 @@ class Generator extends AbstractSchemaGenerator
     const UNAUTHORIZED_DESCRIPTION = '401 Unauthorized';
 
     /** Array signifier */
-    const ARRAY_SIGNIFIER = '[]';
+    const ARRAY_SIGNIFIER = '[0]';
 
     /**
      * Swagger factory instance.

app/design/frontend/Magento/luma/Magento_Checkout/web/css/source/module/checkout/_payments.less

@@ -58,6 +58,10 @@
                     }
                 }
             }
+
+            #po_number {
+                margin-bottom: 20px;
+            }
         }
 
         .payment-method-title {