Dump of Closure for function/method should dump the function/method name

### Description

https://3v4l.org/s8HvF

I would expect:

```diff
 Closure Object
 (
     [this] => Foo Object
         (
         )
+    [method] => bar
 )
 Closure Object
 (
+    [class] => Foo
+    [method] => barS
 )
 Closure Object
 (
+    [function] => x
 )
```