ansible/changelogs/fragments/74256-set-theory-filters-behavior.yml

breaking_changes:
  - intersect, difference, symmetric_difference, union filters - the default behavior
    is now to be case-sensitive (https://github.com/ansible/ansible/issues/74255)
  - unique filter - the default behavior is now to fail if Jinja2's filter fails and
    explicit ``case_sensitive=False`` as the Ansible's fallback is case-sensitive
    (https://github.com/ansible/ansible/pull/74256)