https://franktheprogrammer.com/blog/php/type-hinting-with-the-iterable-pseudo-type-in-php
Type Hinting With The Iterable pseudo-type In PHP
As of PHP 7.1, you can now type hint your method/function arguments with the keyword iterable for handling arrays or even objects that implement the...
type hintingiterablepseudophp
https://teclado.com/30-days-of-python/python-30-day-28-type-hinting/
Day 28: Type Hinting | Teclado
type hintingdayteclado