func (c *Cache) GetShard(key string) *Shard {
	// @TODO: remove type casts?
	return c.data[uint(fnv32(key))%uint(shardCount)]
}
func (c *Cache) GetShard(key string) *Shard {
	// @TODO: remove type casts?
	return c.data[uint(fnv32(key))%uint(shardCount)]
}
// GetShard returns shard under given key