Issue with extending \ArrayObject

[mimou78]

Bug Report

Q	A
Version(s)	4.10.0
PHP version	8.1

Summary

Create a simple class whe extend \ArrayObjec e.g.
class Param extends \ArrayObject {}
and after create a class who inject thi class in his l'une de ces method.
class Bug { public function test(Param $param) { } }
If we try to fdo a reflection with this class/method we git this error

Current behavior

We got the error:
Call to undefined method ReflectionUnionType::isBuiltin()#0

How to reproduce

Create a simple class that extends the \ArrayObject class, eg:

class Param extends \ArrayObject {}

and then you have to create a class that injects this class in one of its methods, eg:

class Bug { public function test(Param $param) { } }

And then you have to try to do a reflection with this class/method using Laminas Reflection

see here magento/magento2#35448

[mimou78]

Hello,

if you are interested he can offer a fix and send a PR

[Ocramius]

Do please feel free to send a patch against 4.11.x (testa though!)

[kallard1]

@mimou78, you don't share fix ?