Resolve #3469665 "Prop types tests"

Closes #3469665

src/Plugin/UiPatterns/PropType/BooleanPropType.php

@@ -6,6 +6,7 @@ namespace Drupal\ui_patterns\Plugin\UiPatterns\PropType;
 
 use Drupal\Core\StringTranslation\TranslatableMarkup;
 use Drupal\ui_patterns\Attribute\PropType;
+use Drupal\ui_patterns\PropTypeConversionTrait;
 use Drupal\ui_patterns\PropTypePluginBase;
 
 /**
@@ -22,10 +23,20 @@ use Drupal\ui_patterns\PropTypePluginBase;
 )]
 class BooleanPropType extends PropTypePluginBase {
 
+  use PropTypeConversionTrait;
+
   /**
    * {@inheritdoc}
    */
   public static function normalize(mixed $value, ?array $definition = NULL): bool {
+    if (is_bool($value)) {
+      return $value;
+    }
+    static::convertToScalar($value);
+    if (is_numeric($value) && is_string($value)) {
+      $value = (int) $value;
+      return (bool) $value;
+    }
     return (bool) $value;
   }