Extends hashtable_apply_to_all_payloads() by proposing an additional function hashtable_apply_to_all_payloads_user_data(), which makes user data available when iterating over payloads.
This pull request also contains tests.
Extends hashtable_apply_to_all_payloads() by proposing an additional function hashtable_apply_to_all_payloads_user_data(), which makes user data available when iterating over payloads.
This pull request also contains tests.