#3498774 Explicitly cast $value to string in StripTagsFilter plugin.

Closes #3498774

src/Plugin/TypedDataFilter/StripTagsFilter.php

@@ -9,6 +9,7 @@ use Drupal\Core\StringTranslation\TranslatableMarkup;
 use Drupal\Core\TypedData\DataDefinition;
 use Drupal\Core\TypedData\DataDefinitionInterface;
 use Drupal\Core\TypedData\Type\StringInterface;
+use Drupal\text\TextProcessed;
 use Drupal\typed_data\Attribute\DataFilter;
 use Drupal\typed_data\DataFilterBase;
 
@@ -30,14 +31,15 @@ class StripTagsFilter extends DataFilterBase {
    * {@inheritdoc}
    */
   public function filter(DataDefinitionInterface $definition, $value, array $arguments, ?BubbleableMetadata $bubbleable_metadata = NULL) {
-    return strip_tags($value);
+    return strip_tags((string) $value);
   }
 
   /**
    * {@inheritdoc}
    */
   public function canFilter(DataDefinitionInterface $definition): bool {
-    return is_subclass_of($definition->getClass(), StringInterface::class);
+    return is_subclass_of($definition->getClass(), StringInterface::class)
+      || is_a($definition->getClass(), TextProcessed::class, TRUE);
   }
 
   /**