PHP 8.1 Deprecation: DusanKasan\Knapsack\Collection implements the Serializable interface, which is deprecated #77
Description
Running PHP 8.1 the following info is logged:
Deprecated: DusanKasan\Knapsack\Collection implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary)