I've started a straw poll https://wiki.php.net/rfc/readline_interactive_shell_result_function_straw_poll after feedback on the RFC: https://externals.io/message/112568#112737
Notably, there was discussion of whether it made sense to provide the ability to dump expression results without doing it by default,
as well as whether php should go in a different direction to make it easier for userland shells to replace
php -a instead.
Voting on the straw poll starts today and ends 2021-01-14