system/Cache/Handlers/MemcachedHandler.php
public function delete(string $key)
	{
		$key = $this->prefix . $key;

		return $this->memcached->delete($key);
	}
public function delete(string $key)
	{
		$key = $this->prefix . $key;

		return $this->memcached->delete($key);
	}
Deletes a specific item from the cache store.

@param string $key Cache item name

@return mixed