Edit a user — Allows unsetting either the email or username, as long as the user retains at least one valid identifier. Attempting to remove both results in a 400 error with code userShouldHaveAtLeastOneValidIdentifier.
Remove users from groups – Aligns bulk removal of learner roles from groups with the single-route Remove a user's role: Learners are now removed from public subgroups only, and the cascade stops at the first private subgroup encountered. (Previously, bulk removal for learners affected all subgroups, including private ones.)