Hello, dear Internals. First, thanks to Niklas Keller for giving me permission to write an *RFC*! After that, I like to propose and discuss a new function for PHP 7.x (current 7.3): is_countable.
*RFC*: https://wiki.php.net/rfc/is-countable. I tried to describe everything there, but of course, let's discuss everything that should be improved to get this functions merged into the Core. Thanks, -- Gabriel Caruso
