Remove strict array typing to fill()

src/Discord/Helpers/CollectionInterface.php

@@ -23,7 +23,7 @@ public function get(string $discrim, $key);
     public function set($offset, $value);
     public function pull($key, $default = null);
     public function shift();
-    public function fill(array $items): self;
+    public function fill($items): self;
     public function push(...$items): self;
     public function pushItem($item): self;
     public function count(): int;

src/Discord/Helpers/CollectionTrait.php

@@ -134,12 +134,18 @@ public function shift()
     /**
      * Fills an array of items into the collection.
      *
-     * @param array $items
+     * @param CollectionInterface|array $items
      *
      * @return self
      */
-    public function fill(array $items): self
+    public function fill($items): self
     {
+        if ($items instanceof CollectionInterface) {
+            $items = $items->toArray();
+        }
+        if (! is_array($items)) {
+            throw new \InvalidArgumentException('The fill method only accepts arrays or CollectionInterface instances.');
+        }
         foreach ($items as $item) {
             $this->pushItem($item);
         }