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Setting random could increase reproducibility of test in some cases. Patch suggests three providers for seed: time (default), strong random generator (if available) and unsigned constant. Seed could be set from command line or enviroment variable. Author: Fabien Coelho Reviewed by: Chapman Flack Discussion: https://www.postgresql.org/message-id/flat/20160407082711.q7iq3ykffqxcszkv@alap3.anarazel.de