escape function does not always take a string

Korbeil · Korbeil · commit 0613f7df684a · 2019-02-07T13:49:07.000+01:00
diff --git a/src/Symfony/Component/Workflow/Dumper/GraphvizDumper.php b/src/Symfony/Component/Workflow/Dumper/GraphvizDumper.php
@@ -204,9 +204,16 @@ protected function dotize($id)
     /**
      * @internal
      */
-    protected function escape(string $string): string
+    protected function escape($value): string
     {
-        return addslashes($string);
+        if (\is_string($value)) {
+            $value = \addslashes($value);
+        }
+        if (\is_bool($value)) {
+            $value = $value ? '1' : '0';
+        }
+
+        return $value;
     }
 
     private function addAttributes(array $attributes): string
