Align return types.

src/Contract/Appendable.php

@@ -14,7 +14,7 @@ interface Appendable
      *
      * @param mixed ...$items
      *
-     * @return \drupol\collection\Contract\Base
+     * @return \drupol\collection\Contract\Collection
      */
     public function append(...$items): Base;
 }

src/Contract/Applyable.php

@@ -14,7 +14,7 @@ interface Applyable
      *
      * @param callable ...$callables
      *
-     * @return \drupol\collection\Contract\Base
+     * @return \drupol\collection\Contract\Collection
      */
     public function apply(callable ...$callables): Base;
 }

src/Contract/Chunkable.php

@@ -14,7 +14,7 @@ interface Chunkable
      *
      * @param int $size
      *
-     * @return \drupol\collection\Contract\Base
+     * @return \drupol\collection\Contract\Collection
      */
     public function chunk(int $size): Base;
 }

src/Contract/Collection.php

@@ -77,12 +77,4 @@ public static function range(int $start = 0, $end = \INF, $step = 1): Collection
      * @return \drupol\collection\Contract\Collection
      */
     public static function times($number, callable $callback = null): Collection;
-
-    /**
-     * @param callable $callback
-     * @param mixed $initial
-     *
-     * @return \drupol\collection\Contract\Collection
-     */
-    public static function iterate(callable $callback, $initial = null): Collection;
 }

src/Contract/Walkable.php

@@ -12,7 +12,7 @@ interface Walkable
     /**
      * @param callable ...$callbacks
      *
-     * @return \drupol\collection\Contract\Collection|\drupol\collection\Contract\Collection
+     * @return \drupol\collection\Contract\Collection
      */
     public function walk(callable ...$callbacks): Base;
 }