Fix RedisCluster::multi() return type (#4283)

Author: sayuprc

resources/functionMap.php

@@ -8896,7 +8896,7 @@
 'RedisCluster::mget' => ['array', 'array'=>'array'],
 'RedisCluster::mset' => ['bool', 'array'=>'array'],
 'RedisCluster::msetnx' => ['int', 'array'=>'array'],
-'RedisCluster::multi' => ['Redis', 'mode='=>'int'],
+'RedisCluster::multi' => ['__benevolent<RedisCluster|bool>', 'mode='=>'int'],
 'RedisCluster::object' => ['string', 'string='=>'string', 'key='=>'string'],
 'RedisCluster::persist' => ['bool', 'key'=>'string'],
 'RedisCluster::pExpire' => ['bool', 'key'=>'string', 'ttl'=>'int'],

tests/PHPStan/Analyser/nsrt/bug-13392.php

@@ -0,0 +1,21 @@
+<?php declare(strict_types = 1);
+
+namespace Bug13392;
+
+use RedisCluster;
+
+use function PHPStan\Testing\assertType;
+
+interface Client
+{
+	public function get(): RedisCluster;
+}
+
+function func(Client $client): void
+{
+	$redisCluster = $client->get();
+	assertType('RedisCluster',$redisCluster);
+
+	$transaction = $redisCluster->multi();
+	assertType('(bool|RedisCluster)',$transaction);	
+}