8481dcedc4
Passing the user group object in case of named user group is fine for `do_change_stream_group_based_setting`. But for anonymous groups, if the code path calling that function is not creating a new anonymous user group, it has to modify the user group by itself before calling that function. In that case, if `old_setting_api_value` is not provided, `old_user_group` is calculated false, since the group id has not changed for the stream, but the group membership has changed. old_setting_api_value will be the same as new_setting_api_value in such a case. It is better to accept the new setting value as either an int or UserGroupMembersDict, so that `do_change_stream_group_based_setting` can decide what to do with that argument.
Zulip overview
Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. Fortune 500 companies, leading open source projects, and thousands of other organizations use Zulip every day. Zulip is the only modern team chat app that is designed for both live and asynchronous conversations.
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