Make sure FieldtypeCheckbox returns boolean

Author: dadish

src/Field/Page/Fieldtype/FieldtypeCheckbox.php

@@ -4,12 +4,19 @@
 
 use Youshido\GraphQL\Type\Scalar\BooleanType;
 use ProcessWire\GraphQL\Field\Page\Fieldtype\AbstractFieldtype;
+use Youshido\GraphQL\Execution\ResolveInfo;
 
 class FieldtypeCheckbox extends AbstractFieldtype {
 
   public function getDefaultType()
   {
     return new BooleanType();
   }
+  
+  public function resolve($value, array $args, ResolveInfo $info)
+  {
+    $fieldName = $this->field->name;
+    return (boolean) $value->$fieldName;
+  }
 
-}
+}