Use strict argument validation for collections

This resolves #106

src/Provider/Node/NodeProviderCollection.php

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * This file is part of the ramsey/uuid library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ */
+
+declare(strict_types=1);
+
+namespace Ramsey\Uuid\Provider\Node;
+
+use Ramsey\Collection\AbstractCollection;
+use Ramsey\Collection\CollectionInterface;
+use Ramsey\Uuid\Provider\NodeProviderInterface;
+
+/**
+ * A collection of NodeProviderInterface objects
+ */
+class NodeProviderCollection extends AbstractCollection implements CollectionInterface
+{
+    public function getType(): string
+    {
+        return NodeProviderInterface::class;
+    }
+}