While working on PHPC-1598, I learned that PHP 7.4 introduced a new get_properties_for handler in 7ec8087. That API would allow us to explicitly handle var_export (among other contexts) and avoid the issue in PHPC-1598 where relying on get_properties for debugging purposes caused issues with garbage collection.

We should investigate whether we can start using the new handler while also providing a BC layer for versions prior to 7.4.