system/Cache/Handlers/PredisHandler.php
public function increment(string $key, int $offset = 1)
	{
		return $this->redis->hincrby($key, 'data', $offset);
	}
public function increment(string $key, int $offset = 1)
	{
		return $this->redis->hincrby($key, 'data', $offset);
	}
Performs atomic incrementation of a raw stored value.

@param string  $key    Cache ID
@param integer $offset Step/value to increase by

@return mixed