<…>’ or
‘alter’ or ‘drop’ or a combination.
object-type (string) – |‘space’ or ‘function’ or ‘sequence’ or ‘role’|.
object-name (string) – name of object to grant permissions for<…>
https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_schema/user_grant/
object-type is any of ‘space’, ‘index’, ‘sequence’, ‘function’, ‘user’, ‘role’, or ‘universe’; as the Access control topic says