Would you please have a code snippet for me that demonstrates this?

I just tried making a verifiable example and found out, that using __debugInfo will give you the weird output.

https://3v4l.org/uiPv8

Output with debugInfo:
class h#205 (1) {
public ${830734356} =>
string(5) "hallo"
}

Output without debugInfo:
class h#205 (1) {
public $data =>
array(1) {
[373556941768884244] =>
string(5) "hallo"
}
}

Thanks for your report, this should be fixed for Xdebug 2.6.0.

That said, you might want to test the 2.6.0beta1 binaries when they become available.