ReflectionFunction::getClosureThis() return ReflectionMethod

In this code:

``` php
class Test
{
function method() {}
}

$obj = new Test;
$closure = (new \ReflectionMethod('Test', 'method'))->getClosure($obj);

$ref = new \ReflectionFunction($closure);
$obj2 = $ref->getClosureThis();
```

in PHP `$obj === $obj2`
in HHVM `$obj2` is instance of ReflectionMethod

demo http://3v4l.org/OjCTd