libdbix-class-optimisticlocking-perl 0.02-4 (s390x binary) in ubuntu focal

 Optimistic locking is an alternative to using exclusive locks when you
 have the possibility of concurrent, conflicting updates in your database.
 The basic principle is you allow any and all clients to issue updates and
 rather than preemptively synchronizing all data modifications (which is
 what happens with exclusive locks) you are "optimistic" that updates won't
 interfere with one another and the updates will only fail when they do
 in fact interfere with one another.