`iterall` is a tiny (< 1 KB) zero‑dependency utility library that adds full support for the Iterator, Iterable, AsyncIterator and AsyncIterable protocols across all JavaScript environments, including old browsers that lack native Symbol‑based iteration. It provides helpers such as `isCollection`, `forEach`, `forAwaitEach`, and iterator creators so library authors can accept any iterable or array‑like data structure and work with asynchronous streams without pulling in larger dependencies. Suitable for library developers and applications that need cross‑environment iteration support.