Yeah I would still like to understand and look at the code producing the backtrace which causes your failure. Is there any chance you have a link to that?

here is a repo: https://github.com/atk4/core with CI/test failure starting with composer 2.6.0

the actual single usage should not matter much, as more projects can rely on native php-src properties

It matters to me to understand what kind of code causes the failure.. I know the repo is there but I didn't figure out from a quick look the source of the problem, as I am not familiar with it at all. I imagine it'd be easier for you to find out, so it'd be nice if you help.

Sure and thank you.

in phpunit printer the stack trace is redacted by
https://github.com/sebastianbergmann/phpunit/blob/899db92716/src/Framework/ExceptionWrapper.php#L53C58-L53C58
which calls
https://github.com/sebastianbergmann/phpunit/blob/899db92716/src/Util/Filter.php#L64
which redacts the stack trace lines in
https://github.com/sebastianbergmann/phpunit/blob/899db92716/src/Util/Filter.php#L90
and https://github.com/sebastianbergmann/phpunit/blob/899db92716/src/Util/Filter.php#L98

also realpath() is slow (requires many IO syscalls) and can even fail (silently, realpath returns false) if the $binPathExported is not on physical disk - repro https://3v4l.org/V9GMD (see last line, wrapper is copied example from https://www.php.net/manual/en/stream.streamwrapper.example-1.php)

Ok yeah I see, thanks.