[RFC] Reflection for references

Hi internals, I'd like to propose the addition of a ReflectionReference class, as described in the following RFC: https://wiki.php.net/rfc/reference_reflection This topic was previously discussed at https://externals.io/message/102638. The TL;DR is that some libraries need a way to detect references and determine whether two references are the same. They previously used an ugly hack to achieve this, but this hack will no longer (reliably) work due to the introduction of typed properties, so we need to do something about this for the 7.4 release. Regards, Nikita