Fix typing information.

Author: drupol

src/SimpleCachingIteratorAggregate.php

@@ -25,7 +25,9 @@
 final class SimpleCachingIteratorAggregate implements IteratorAggregate
 {
     /**
-     * @var CachingIterator<TKey, T>
+     * // TODO: Remove this when PSalm 5 is released.
+     * @psalm-var CachingIterator<TKey, T>
+     * @phpstan-var CachingIterator<TKey, T, Iterator<TKey, T>>
      */
     private CachingIterator $iterator;