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Relation options can define a lock mode other than AccessExclusiveMode since 47167b7, but modules defining custom relation options did not really have a way to enforce that. Correct that by extending the current API set so as modules can define a custom lock mode. Author: Michael Paquier Reviewed-by: Kuntal Ghosh Discussion: https://postgr.es/m/20190920013831.GD1844@paquier.xyz