was verified with following Python script:

import who_added_this_tag

config = {
    'key': 'name',
    'value': 'BRAND', # may be None - in such case it looks for all values of key
    'area_identifier_key': None, # may be None, in such case search is worldwide, 'ISO3166-1' is a good identifier
    'area_identifier_value': None, # ignored if area_identifier_key is None
    'list_all_edits': True,
    'list_all_edits_made_by_this_users': [], # ignored with list_all_edits set to True
}
who_added_this_tag.statistics.process_case(config)

