Make iterator_to_array() accept all iterables

Hi Internals I've come across a case where it would've been useful if iterator_to_array() would accept iterable instead of Traversable to avoid checking whether the input variable already is an array. To not repeat what I've already written in my proposed PR, please see: https://github.com/php/php-src/pull/8819 for more details. In response to my question whether this would require an RFC or whether this is simple enough, cmb pointed to a previous RFC that proposed *adding* a new function iterable_to_array() which was declined: https://wiki.php.net/rfc/iterable_to_array-and-iterable_count cmb also suggested that for this reason this topic should at least be shortly discussed on the list, which I intend to do with this email: - Do you believe that my PR requires an RFC / do you want to see an RFC for this? - Would you object to extending 'iterator_to_array' from Traversable to iterable (i.e. to Traversable|array)? Best regards Tim Düsterhus