[VOTE] Undefined Property Error Promotion

Internals,

I have now opened voting on Undefined Property Error Promotion.

https://wiki.php.net/rfc/undefined_property_error_promotion

Voting ends 2022-05-05

Summary:

This RFC seeks to prevent execution continuing if the user has accessed
an undefined property without specifying that it was their intent to
potentially do so.

This RFC is designed to compliment the Undefined Variable Error
Promotion, and Deprecate Dynamic Properties RFCs that have already passed.