Starting with Redis version 6.0.0: timeout is interpreted as a double instead of an integer.

public function receive(int $timeout = 0): ?Message
{
    $timeout = (float) ($timeout / 1000);

    if ($timeout <= 0) {
        while (true) {
            if ($message = $this->receive(600000)) {
                return $message;
            }
        }
    }

    return $this->receiveMessage([$this->queue], $timeout, $this->redeliveryDelay);
}

public function brpop(array $keys, float $timeout): ?RedisResult
{
    try {
        if ($result = $this->redis->rawCommand('brpop', \implode(' ', $keys), $timeout)) {
            return new RedisResult($result[0], $result[1]);
        }

        return null;
    } catch (\RedisException $e) {
        throw new ServerException('brpop command has failed', 0, $e);
    }
}

public function brpop(array $keys, float $timeout): ?RedisResult
{
    try {
        if ($result = $this->redis->brpop($keys, $timeout)) {
            return new RedisResult($result[0], $result[1]);
        }

        return null;
    } catch (PRedisServerException $e) {
        throw new ServerException('brpop command has failed', 0, $e);
    }
}