diff -u b/core/lib/Drupal/Core/Render/Element/Radio.php b/core/lib/Drupal/Core/Render/Element/Radio.php
--- b/core/lib/Drupal/Core/Render/Element/Radio.php
+++ b/core/lib/Drupal/Core/Render/Element/Radio.php
@@ -65,18 +65,8 @@
       // To avoid auto-casting during '==' we convert int 0 to '0' for both
       // operands. It will prevent wrong true-checking for both cases: 0 ==
       // 'string' and 'string' == 0.
-      if ($element['#value'] === 0) {
-        $element['#value'] = '0';
-      }
-      elseif ($element['#value'] === TRUE) {
-        $element['#value'] = '1';
-      }
-      if ($element['#return_value'] === 0) {
-        $element['#return_value'] = '0';
-      }
-      elseif ($element['#return_value'] === TRUE) {
-        $element['#return_value'] = '1';
-      }
+      $element['#value'] = static::castValue($element['#value'];
+      $element['#return_value'] = static::castValue($element['#return_value'];
 
       if ($element['#value'] == $element['#return_value']) {
         $element['#attributes']['checked'] = 'checked';
diff -u b/core/modules/system/tests/modules/form_test/src/Form/FormTestRadiosCheckedForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestRadiosCheckedForm.php
--- b/core/modules/system/tests/modules/form_test/src/Form/FormTestRadiosCheckedForm.php
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestRadiosCheckedForm.php
@@ -1,10 +1,5 @@
 <?php
 
-/**
- * @file
- * Contains \Drupal\form_test\Form\FormTestRadiosCheckedForm.
- */
-
 namespace Drupal\form_test\Form;
 
 use Drupal\Core\Form\FormBase;
reverted:
--- b/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
+++ a/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
@@ -1702,7 +1702,7 @@
         break;
       case 'link_display':
         $form['#title'] .= $this->t('Which display to use for path');
+        $options = array(FALSE => $this->t('None'), 'custom_url' => $this->t('Custom URL'));
-        $options = array('' => $this->t('None'), 'custom_url' => $this->t('Custom URL'));
 
         foreach ($this->view->storage->get('display') as $display_id => $display) {
           if ($this->view->displayHandlers->get($display_id)->hasPath()) {