Fixed return type for RedistList::get() (#96)

Expanded allowed types for RedistList::get to include integer.

Author: Bilge

src/Command/RedisList.php

@@ -21,8 +21,10 @@ public function __construct(
 
     /**
      * @link https://redis.io/commands/lindex
+     *
+     * TODO: Change type declaration to int only in next major.
      */
-    public function get(string $index): string
+    public function get(string|int $index): ?string
     {
         return $this->client->execute('lindex', $this->key, $index);
     }

test/Command/RedisListTest.php

@@ -51,6 +51,7 @@ public function test(): void
         $this->assertSame('y', $list->popHeadBlocking());
         $this->assertSame('b', $list->popTailBlocking());
 
+        $this->assertNull($this->redis->getList('nonexistent')->get(0));
         $this->assertNull($this->redis->getList('nonexistent')->popHeadBlocking(1));
         $this->assertNull($this->redis->getList('nonexistent')->popTailBlocking(1));
         $this->assertNull($this->redis->getList('nonexistent')->popTailPushHeadBlocking('nonexistent', 1));