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cruft: option_group for case type
In the tarball, there is a civicrm_option_group record defined for name='case_type' (value=26) that has no corresponding option_value records. There is instead a CiviCRM_case_type table. Likely missed during refactoring to create that table.
Task for a newbie: remove the creation of the option_group from the tarball, and on upgrade remove the record in civicrm_option_group table for it.